Dogs’ Eyes Have Changed Since Humans Befriended Them(theatlantic.com)
theatlantic.com
Dogs’ Eyes Have Changed Since Humans Befriended Them
https://www.theatlantic.com/article/591868/
122 comments
My 12 year old labrador is in excellent shape, but his hearing is no longer quite up to scratch, and to avoid embarrassing levels of shouting when we are out and about, I increasingly use pointing and other signs at my end of our communication. Also, his left eye has been problematic for many years, and apparently only registers the haziest of outlines these days.
And yet, he contantly amazes me by the range and precision of his vision. Downwards pointing with my left arm means come here at once, which he will reliably register at a distance more than a hundred meters. Other dogs he will recognize at distances further than that, and he will unerringly home in on thrown stick bobbing on the water, as long as it's on the right, where his good eye can see.
Clearly, there's more to it than just they are short sighted.
And yet, he contantly amazes me by the range and precision of his vision. Downwards pointing with my left arm means come here at once, which he will reliably register at a distance more than a hundred meters. Other dogs he will recognize at distances further than that, and he will unerringly home in on thrown stick bobbing on the water, as long as it's on the right, where his good eye can see.
Clearly, there's more to it than just they are short sighted.
As a nearsighted human who didn't get glasses as early as he should have, I used to use people's gait or clothing to recognize them at long distances. You know your dog best, just saying there can be ways to compensate.
Without a doubt, yes, all sorts of compensation are at play. Still, the fact remains that he reliably picks up my relatively subdued sign language at great distance. And swimming, even in rough sea, if he can't pick out the floating stick, he'll look to me, I'll point, he will scan as directed, and head straight for the thing. One way or the other, all this is decent visual performance, nothing nearsighted about it.
We all compensate for the handicaps we have. I'm also was very nearsighted since I was about 11. I did get glasses but didn't use them while skiing, not very confy under the helmet. But I could still see who of my classmates were at the bottom of the mountain, about 300 m away, because of the movement pattern. I have no clue how we know how dogs have bad eye sight, I can't even begin to imagine how we know about T-Rex. I have to look at that link someone posted.
I have noticed my dog scans people visually at a great distance. (Looking for people he might know, I imagine.)
> As well, did you know lights have a flicker? If you think it's bad, it's even worse for dogs which can lead to stress.
As someone who notices and gets really tired from the stroboscopic effects of cheap LEDs, I can only imagine how terrible that must be for dogs
As someone who notices and gets really tired from the stroboscopic effects of cheap LEDs, I can only imagine how terrible that must be for dogs
Another dog sense I've wondered about is hearing. What is our music like to them?
Let's consider live music, first. A lot of instruments have significant harmonics well above 20 KHz. So let's say you are practicing your violin or trumpet, and your dog is in the room. The maker of your instrument took great care to get the sound right, which mainly consists of making sure that the various harmonics are at the right relative amplitudes.
Does the instrument maker take any care to get the harmonics above 20 KHz right? They don't affect how the instrument sounds to humans, so I'd expect not. That could mean that your beautiful violin has a horrible screech that only your dog hears.
How about recorded music? If my guess is right and our instruments sound bad above 20 KHz, recorded music may be an improvement from the dog's point of view, because we filter out those highs when recording.
But if live instruments do actually sound OK above 20 KHz, then to a dog our record are going to seem limited at best.
Let's consider live music, first. A lot of instruments have significant harmonics well above 20 KHz. So let's say you are practicing your violin or trumpet, and your dog is in the room. The maker of your instrument took great care to get the sound right, which mainly consists of making sure that the various harmonics are at the right relative amplitudes.
Does the instrument maker take any care to get the harmonics above 20 KHz right? They don't affect how the instrument sounds to humans, so I'd expect not. That could mean that your beautiful violin has a horrible screech that only your dog hears.
How about recorded music? If my guess is right and our instruments sound bad above 20 KHz, recorded music may be an improvement from the dog's point of view, because we filter out those highs when recording.
But if live instruments do actually sound OK above 20 KHz, then to a dog our record are going to seem limited at best.
> Another dog sense I've wondered about is hearing. What is our music like to them?
This is a thing I've wondered about too. Their frequency range is only part of it. There's also the frequency weighted sensitivity; it's why we humans perceive music the way we do. A dog might be able to hear a tone at 45kHz, but it might require significant amplitude, e.g. threshold of perception at 45kHz might be 80 dB SPL. The ISO 226:2003 equal loudness contours shows that human sensitivity for high frequencies falls off very sharply after about 16kHz[1]. Looking stuff up for dogs, I'm finding mixed results, so I'm less confident in my assertion here, but it seems to me that dog hearing still falls off sharply near the upper end of it's range. From the charts I find, a dog's sensitive band seems to be wider than humans and centered higher[2], but there's still that sharp upper cutoff.
> Let's consider live music, first. A lot of instruments have significant harmonics well above 20 kHz.
This is heavily dependent on the nature of the instrument. A bass instrument like a tuba or a bass guitar isn't going to have much frequency content once it gets into the mid-to-high hundreds of Hz. A guitar is going to be done between 10-15kHz, and most of it's frequency content that defines its character is going to be down in the mid-range (mid-hundreds to low thousands of Hz). Cymbals? Yeah, I'd be in no way surprised if those contain tons of content above 20kHz that's only detectable with lab equipment or a dog's ears.
> Does the instrument maker take any care to get the harmonics above 20 KHz right? They don't affect how the instrument sounds to humans, so I'd expect not. That could mean that your beautiful violin has a horrible screech that only your dog hears.
Instruments with significant frequency content in our most sensitive bands (e.g. human voice, eletric guitar, trumpet) are often considered 'lead' instruments, and they're are also the ones where getting the frequency balance right to sound good instead of harsh is the trickiest. So, my intuition is that a similar thing plays out with dogs. Those instruments that do contain significant frequency content in the high kHz to low 10s of kHz (e.g. cymbals) are more likely to sound harsh, IMO. Something like a tuba, a dog probably cares less.
> How about recorded music? If my guess is right and our instruments sound bad above 20 KHz, recorded music may be an improvement from the dog's point of view, because we filter out those highs when recording.
> But if live instruments do actually sound OK above 20 KHz, then to a dog our record are going to seem limited at best.
My guess here is that our recordings probably sound unnaturally muffled. In my own study of recording and mixing, it seems common to filter sharply above 20Khz, or maybe a little less, because their's no sense in frying the tweeters with content nobody can hear anyway. Additionally, the DACs in modern recording gear are going to have their filters set to filter sharply above 20kHz anyway, to keep digital aliasing noise from impairing an accurate reproduction of the original analog signal from the digital one. It might not sound bad to the dog, but I'm pretty sure a dog would be able to easily tell the difference between a recording of a cymbal, and a live cymbal.
1. https://en.wikipedia.org/wiki/Equal-loudness_contour
2. https://www.lsu.edu/deafness/HearingRange.html
This is a thing I've wondered about too. Their frequency range is only part of it. There's also the frequency weighted sensitivity; it's why we humans perceive music the way we do. A dog might be able to hear a tone at 45kHz, but it might require significant amplitude, e.g. threshold of perception at 45kHz might be 80 dB SPL. The ISO 226:2003 equal loudness contours shows that human sensitivity for high frequencies falls off very sharply after about 16kHz[1]. Looking stuff up for dogs, I'm finding mixed results, so I'm less confident in my assertion here, but it seems to me that dog hearing still falls off sharply near the upper end of it's range. From the charts I find, a dog's sensitive band seems to be wider than humans and centered higher[2], but there's still that sharp upper cutoff.
> Let's consider live music, first. A lot of instruments have significant harmonics well above 20 kHz.
This is heavily dependent on the nature of the instrument. A bass instrument like a tuba or a bass guitar isn't going to have much frequency content once it gets into the mid-to-high hundreds of Hz. A guitar is going to be done between 10-15kHz, and most of it's frequency content that defines its character is going to be down in the mid-range (mid-hundreds to low thousands of Hz). Cymbals? Yeah, I'd be in no way surprised if those contain tons of content above 20kHz that's only detectable with lab equipment or a dog's ears.
> Does the instrument maker take any care to get the harmonics above 20 KHz right? They don't affect how the instrument sounds to humans, so I'd expect not. That could mean that your beautiful violin has a horrible screech that only your dog hears.
Instruments with significant frequency content in our most sensitive bands (e.g. human voice, eletric guitar, trumpet) are often considered 'lead' instruments, and they're are also the ones where getting the frequency balance right to sound good instead of harsh is the trickiest. So, my intuition is that a similar thing plays out with dogs. Those instruments that do contain significant frequency content in the high kHz to low 10s of kHz (e.g. cymbals) are more likely to sound harsh, IMO. Something like a tuba, a dog probably cares less.
> How about recorded music? If my guess is right and our instruments sound bad above 20 KHz, recorded music may be an improvement from the dog's point of view, because we filter out those highs when recording.
> But if live instruments do actually sound OK above 20 KHz, then to a dog our record are going to seem limited at best.
My guess here is that our recordings probably sound unnaturally muffled. In my own study of recording and mixing, it seems common to filter sharply above 20Khz, or maybe a little less, because their's no sense in frying the tweeters with content nobody can hear anyway. Additionally, the DACs in modern recording gear are going to have their filters set to filter sharply above 20kHz anyway, to keep digital aliasing noise from impairing an accurate reproduction of the original analog signal from the digital one. It might not sound bad to the dog, but I'm pretty sure a dog would be able to easily tell the difference between a recording of a cymbal, and a live cymbal.
1. https://en.wikipedia.org/wiki/Equal-loudness_contour
2. https://www.lsu.edu/deafness/HearingRange.html
> Looking stuff up for dogs, I'm finding mixed results, so I'm less confident in my assertion here
I was kind of surprised at how little information I could find a while back when I searched online for information about animal hearing and animal vision. I was playing around with making a camera to automatically take a photo whenever an animal stopped by to eat the seeds and nuts I put out for them.
I've got a sensor that measures the distance to an object by bouncing an infrared laser off it. It's a class 1 laser, which basically means that it is not possible to exceed safe exposure by looking at it, even with a microscope or telescope. But that's for humans. What if a curious bird decided to get right up to it and take a look?
I couldn't find anything on laser safety for birds or squirrels or other animals likely to visit.
I've also got a distance sensor that uses a 40 KHz ultrasonic pulse. I couldn't find anything on the safety of that, either, for animals.
I did some tests with the IR laser and found that it didn't work very well for this application. It worked great at detecting when my hand was in front of it, but was very flaky with birds and squirrels. I guess features and fur just doesn't reflect IR light well enough.
Ultrasonic worked better, and so that's still in the running if I ever get time to finish this thing. I still don't know about safety of that for the animals, but figure that if the animal can hear it they will stay away if it is loud enough to harm them.
Alternatively, I may just go with having the camera take a photo every second, and try to figure out in software which ones have an animal in them. No risk of harming the animal that way, and also the camera could then be in my house looking out a window instead of outside, which would make power a lot easier and get rid of the need for weatherproofing it.
I was kind of surprised at how little information I could find a while back when I searched online for information about animal hearing and animal vision. I was playing around with making a camera to automatically take a photo whenever an animal stopped by to eat the seeds and nuts I put out for them.
I've got a sensor that measures the distance to an object by bouncing an infrared laser off it. It's a class 1 laser, which basically means that it is not possible to exceed safe exposure by looking at it, even with a microscope or telescope. But that's for humans. What if a curious bird decided to get right up to it and take a look?
I couldn't find anything on laser safety for birds or squirrels or other animals likely to visit.
I've also got a distance sensor that uses a 40 KHz ultrasonic pulse. I couldn't find anything on the safety of that, either, for animals.
I did some tests with the IR laser and found that it didn't work very well for this application. It worked great at detecting when my hand was in front of it, but was very flaky with birds and squirrels. I guess features and fur just doesn't reflect IR light well enough.
Ultrasonic worked better, and so that's still in the running if I ever get time to finish this thing. I still don't know about safety of that for the animals, but figure that if the animal can hear it they will stay away if it is loud enough to harm them.
Alternatively, I may just go with having the camera take a photo every second, and try to figure out in software which ones have an animal in them. No risk of harming the animal that way, and also the camera could then be in my house looking out a window instead of outside, which would make power a lot easier and get rid of the need for weatherproofing it.
try candles. natural light for me gives me least issues. most electric lights are exhausting...
Candles generate soot, which is not good for your health. The soot will also stain walls and ceilings, similar to cigarette smoke. Natural waxes like beeswax candles have a cleaner burn, but they're very expensive.
If you're going to go non-electrical, I think an oil lamp (e.g. paraffin) is your best bet. Very cheap, safer than candles in the right lantern, and clean-burning (assuming a quality oil that doesn't have a lot of sulfur and other pollutants).
If you're going to go non-electrical, I think an oil lamp (e.g. paraffin) is your best bet. Very cheap, safer than candles in the right lantern, and clean-burning (assuming a quality oil that doesn't have a lot of sulfur and other pollutants).
Incandescent light is generally better for the environment though (IIRC LowTechMagazine did the math for this)
I'll take that over florescent any day of the week.
Flickering fluorescent is soulsucking, I agree.
Technically speaking, a similar kind of solution that exists for LEDs also exist for fluorescent tubes: using high frequency ballasts that do not perceptibly flicker (not even (near)subconsciously - which is true for a lot of LED and fluorescent lights). Those are more expensive, hard to find and not the default though.
Technically speaking, a similar kind of solution that exists for LEDs also exist for fluorescent tubes: using high frequency ballasts that do not perceptibly flicker (not even (near)subconsciously - which is true for a lot of LED and fluorescent lights). Those are more expensive, hard to find and not the default though.
3. The flicker fusion issue mostly applies to cathode ray displays and moving pictures. Many LCDs use flickering light (PWM) for backlight, but usually at more than 200Hz. Better LCDs use linear current sources for backlight, so there's no flicker at all. An LCD should be fine even for dogs when static images are displayed.
well now i’m curious, since we have a handful of LED bulbs throughout the house. they flicker no doubt, detectable through the slow motion setting on my phone camera.
any suggestions on what energy efficient bulbs to replace them with?!
any suggestions on what energy efficient bulbs to replace them with?!
There are plenty of flicker free LEDs available, you just have to check beforehand. AFAIK all Philips LEDs are flicker free now, or at least those branded as “EyeCare”.
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Cheap LED bulbs actually flicker significantly, which I realized when I filmed using my camera's "slow motion" capture at 240 frames per second.
In our bedroom, I put in some LEDs, not realizing there could possibly be a difference between cheap and expensive ones. One night I filmed my cat doing something dumb in slow motion, and when I looked at the playback the whole room was strobing.
It was pretty wild. I might even still have the video, and could see about posting it somewhere.
In our bedroom, I put in some LEDs, not realizing there could possibly be a difference between cheap and expensive ones. One night I filmed my cat doing something dumb in slow motion, and when I looked at the playback the whole room was strobing.
It was pretty wild. I might even still have the video, and could see about posting it somewhere.
You don't need slow motion camera, it's enough with most normal catch the worst offenders in the store if they have those led display sets where you can see the lightbulb lit. Just shove the camera real close to the lightbulb and watch the stripes. If no stripes, put it even closer (almost touching) and if it's still ok, buy it :-)
My dog will watch my LCD TV, she likes watching Minecraft and dog videos.
That's interesting. We switched to LED bulbs in our living room and after that our eldest dog would not settle, I thought maybe the bulbs had a low humming noise he didn't like but it could have been a flicker instead. We switched back and he was fine again.
Or both. Some cheap LEDs have terrible high-pitched humming noises from bad AC to DC converters/transformers.
(A big reason that there's a growing movement questioning if we should have more dedicated DC wires/plugs/sockets in our homes and do AC to DC conversion once for entire circuits instead at the socket/in the plug "wall wart" for every single device. Also interesting that USB A sockets are probably the closest we have to a ubiquitous home standard actually moving in that direction.)
(A big reason that there's a growing movement questioning if we should have more dedicated DC wires/plugs/sockets in our homes and do AC to DC conversion once for entire circuits instead at the socket/in the plug "wall wart" for every single device. Also interesting that USB A sockets are probably the closest we have to a ubiquitous home standard actually moving in that direction.)
My wife was sensitive to the flickering of CFLs and LEDs running on AC, so we installed some dedicated 12V DC circuits in our house and they are really great. We run strings of DC LEDs from them, and they are bright and flicker-free.
You can run the lights off of 12V batteries and charge those from a few solar panels, or just have one dedicated high-quality AC-DC transformer for the DC circuits.
You can run the lights off of 12V batteries and charge those from a few solar panels, or just have one dedicated high-quality AC-DC transformer for the DC circuits.
hmmm, the first 2 months of my (rescued) dog being in my home (a year ago) were anxiety-filled for her, and now i wonder if it was due to the led bulbs. she’s mostly settled now, realizing that home is good for sleep, though still gets nervous here and there. she likes being outside more but that seems to be true of dogs in general.
The flickering thing has always made me feel bad for my dog and dogs in general. My entire office room is monitors/TVs and I can only imagine what she sees, like a rave 24/7. But she will still sleep in here when she can go anywhere else in the house.
I actually got curious about this a year ago when I got a dog and she was watching me paint a wall. I made an iOS app* that allows you to see the color spectrum a dog sees, as well as take video and photos.
Some weekend I hope to make enough time to add something to represent the short sightedness using image depth data as well as a few other features I would like to add.
I actually had not heard about the flicker fusion threshold being different, thanks for the links!
* https://itunes.apple.com/us/app/dog-optics/id1447069492?ls=1...
Some weekend I hope to make enough time to add something to represent the short sightedness using image depth data as well as a few other features I would like to add.
I actually had not heard about the flicker fusion threshold being different, thanks for the links!
* https://itunes.apple.com/us/app/dog-optics/id1447069492?ls=1...
The funny thing with my dog, who we've done some scent work with, is that his nose seems to need to be focused and 'switched on' to really work.
If I throw him a treat and he misses it, he will default to looking around with his eyes and missing it until I point it out. But give him the ready cue, and he can find a tiny piece of food or odour hidden in a drawer in a room in under a minute.
So my take on that is it takes a lot of processing power to run the nose, and after a search session it's definitely nap time.
And side note, I'd like to see AI efforts aiming at the level of a dog before we go for humans. It's amazing what they can do but it takes so long to train them and you have to start from scratch each time.
If I throw him a treat and he misses it, he will default to looking around with his eyes and missing it until I point it out. But give him the ready cue, and he can find a tiny piece of food or odour hidden in a drawer in a room in under a minute.
So my take on that is it takes a lot of processing power to run the nose, and after a search session it's definitely nap time.
And side note, I'd like to see AI efforts aiming at the level of a dog before we go for humans. It's amazing what they can do but it takes so long to train them and you have to start from scratch each time.
I don’t think T-Rexes actually suffered from that problem.
I think that was a "myth" indeed. But the OPs point is still valid. :)
https://www.iflscience.com/plants-and-animals/could-t-rex-re...
Article has a couple of interesting points if people are wondering how we can actually know anything about T-Rex vision.
Article has a couple of interesting points if people are wondering how we can actually know anything about T-Rex vision.
>>> Then again, they can smell you, especially if it's downwind.
Only if the dog is downwind. Contrary to repeated myths about bears, no animal can air-scent objects downwind of themselves.
Only if the dog is downwind. Contrary to repeated myths about bears, no animal can air-scent objects downwind of themselves.
But, they might find your latent scent on the ground or on objects and follow that to you. So, being downwind at the moment is different from having a downwind approach to a new area...
So, is fluorescent lighting in an area with dogs would be bad, or not? Is there method to determine which type of lighting is best? I expect even LED bulbs could flicker based on quality of the line.
Am I wrong in assuming incandescent bulbs would be better
Am I wrong in assuming incandescent bulbs would be better
LEDs can be very bad, depending on the circuitry, to the extent that it's uncomfortable for peoples. Incandescent bulbs won't flicker.
Incandescent bulbs flicker at the rate of the AC current, but the flickering is brighter/dimmer rather than on/off because they stay radiant while hot and cool slowly.
Yes but I guess the amplitude of the flicker must be very low? I'd have thought that if it was at all significant it would be very visually obvious at 50-60Hz
today I learn dogs see us as Simpsons characters
I fully believe that they can also "see" scents, like a cartoon character floating to a pie on a window sill following a path of inhaled visible scent fumes, but I have no evidence of that.
The dog Image Processing Tool is pretty awesome, thanks for the link!
I wonder if is possible design glasses with the same goal.
I wonder if is possible design glasses with the same goal.
The article (and others at e.g. the BBC) seem to say dogs "evolved" this capability in "a remarkably short time".
Is it not fairer to suggest that this is not evolution/natural selection at work here, but rather just selective breeding? I can't think of another species of animal that has been so widely twisted and manipulated in appearance by human's selective breeding than dogs.
Seems odd to suggest that this part of a dogs' body was due to evolution, but that rest of the crazy variety in dogs' body is not? A trait like this that humans like seems like is an obvious thing to get selected surely?
Or is there some strong evidence to suggest that this was really was nothing to do with selective breeding?
Is it not fairer to suggest that this is not evolution/natural selection at work here, but rather just selective breeding? I can't think of another species of animal that has been so widely twisted and manipulated in appearance by human's selective breeding than dogs.
Seems odd to suggest that this part of a dogs' body was due to evolution, but that rest of the crazy variety in dogs' body is not? A trait like this that humans like seems like is an obvious thing to get selected surely?
Or is there some strong evidence to suggest that this was really was nothing to do with selective breeding?
I'm mostly comfortable with thinking it's evolution as crazy variety and selective breeding came very late to the party. Most in the last few hundred years - lots of the breeds we know are from the 17th, 18th and 19th centuries.
I would guess that for most of our co-existence breeding was up to the dog to figure out, which might explain the oldest breeds being of a particular region. Task breeds came very much later.
Edit: Also, how do you selectively breed for muscles that didn't previously exist?
I would guess that for most of our co-existence breeding was up to the dog to figure out, which might explain the oldest breeds being of a particular region. Task breeds came very much later.
Edit: Also, how do you selectively breed for muscles that didn't previously exist?
> selective breeding came very late to the party
I think that breeding before 17th century was focused on the dogs job such as hunting wolves (Wolfhounds), sheep herding (Border Collies), watch dogs.
When you don't breed for apperance and only have a low number of different kinds of jobs for dogs, then you only need very few breeds.
The Irish Wolfhounds were out of jobs in 1786 (no more wolves in Ireland) and the breed practically died out.
I think that breeding before 17th century was focused on the dogs job such as hunting wolves (Wolfhounds), sheep herding (Border Collies), watch dogs.
When you don't breed for apperance and only have a low number of different kinds of jobs for dogs, then you only need very few breeds.
The Irish Wolfhounds were out of jobs in 1786 (no more wolves in Ireland) and the breed practically died out.
What else is selective breeding than evolution where fitness is strongly influenced by a hairless ape?
The article mentions that the trait is observable at only 4 weeks old. It might not be crazy to think that Humans are more likely to select the puppies that demonstrate the trait. It might not be "natural" selection, but if Humans are making a substantial amount of the breeding decisions for dogs then it could still be a form of evolution.
Indeed, selective breeding is sometimes called "artificial selection" as a mirror to the term "natural selection". Both are types of evolution.
It comes down to definition of terms, English words to sub-optimally describe a genetic process... How do you define selective breeding - if humans are selecting for short legs and long torso and small and short hair, over time you will get a Daschund-type shape and look. If selective breeding can include discarding/disliking puppies/young dogs without responsive eyes, then most likely humans did selectively breed dogs for desirable "eye contact" traits. It's quite reasonable given we "chose" dogs for many less physically obvious qualities like temperament, utility, and intelligence.
In the end, we are using words to describe genetic processes. The genetics of dogs have changed remarkably both over the last 200k years and over the last 500 years. In my view, it's a combination of natural selection, unconscious selection, and conscious selection of breeding individuals.
In the end, we are using words to describe genetic processes. The genetics of dogs have changed remarkably both over the last 200k years and over the last 500 years. In my view, it's a combination of natural selection, unconscious selection, and conscious selection of breeding individuals.
Well, humans are part of the environment of dogs - selecting or not.
I wouldn't be surprised if humans haven't changed too since dogs befriended them. I imagine it's really a symbiotic relationship in the wild.
Both are social animals. Dogs have the speed and the teeth. Humans have the brain power, stone throwing and cooking. Dogs can mind the human young to a large extent and humans can feed the baby dogs cooked food. It's win win and a fearsome combination.
Both are social animals. Dogs have the speed and the teeth. Humans have the brain power, stone throwing and cooking. Dogs can mind the human young to a large extent and humans can feed the baby dogs cooked food. It's win win and a fearsome combination.
It would be interesting to look for genetic differences between human populations with a history of intensive domestication like the Maasai and populations that have no or only recent domestication like aboriginal Australians.
Adults that can digest lactose is one trait obviously related to animal husbandry.
I’ve had the exact thoughts. And in fact all domesticated animals change and we change with them as well. Im not only thinking about pets but the all animals that live in (an unfair) symbiosis with humans.
I watched a documentary about domestication a while back. Turns out there are many "corollary features" to being domesticated: for instance, ears falling down are also to be found in domesticated fox.
One of the most common feature across domesticated species was tighter jaws.
Source: https://www.youtube.com/watch?v=_6Zep-GhQYU
One of the most common feature across domesticated species was tighter jaws.
Source: https://www.youtube.com/watch?v=_6Zep-GhQYU
In my experience, the dogs ive been around dont generally look sad. The totality of their facial expressions show their emotion.
Ive a one year old pup, border collie/labrador mix. I can take a quick glance at his face and know exactly how he's feeling. Probably 80% of the time, its pure joy. Happy to run around, chew on toys, jump on the furniture and try and play (unrequitedly) with our cats. About another 10%, he's scared of other animals he can see out of the Windows of our townhouse and barks incessantly. The other 10%, I have no idea.
Eyes on a dog don't tell the whole story. Need to look at eyes, ears, back position, tail and legs to tell.
As I write this, my dog is laying against me, calm amd near sleep. Depending on perspective, I could see his face as seeming sad, but I know he's just sleepy. He's only awake because I am and I've not put him to bed yet. But his face says to me he's calm and content. His breathing is also slowing. His favorite chew toy is inches from his mouth and against my arm and he's content to let it stay there; that's how I know he's tired. If you were to just look at a photo of my dogs face right now, he might appear sad, but I know hes just calm and sleepy.
Ive a one year old pup, border collie/labrador mix. I can take a quick glance at his face and know exactly how he's feeling. Probably 80% of the time, its pure joy. Happy to run around, chew on toys, jump on the furniture and try and play (unrequitedly) with our cats. About another 10%, he's scared of other animals he can see out of the Windows of our townhouse and barks incessantly. The other 10%, I have no idea.
Eyes on a dog don't tell the whole story. Need to look at eyes, ears, back position, tail and legs to tell.
As I write this, my dog is laying against me, calm amd near sleep. Depending on perspective, I could see his face as seeming sad, but I know he's just sleepy. He's only awake because I am and I've not put him to bed yet. But his face says to me he's calm and content. His breathing is also slowing. His favorite chew toy is inches from his mouth and against my arm and he's content to let it stay there; that's how I know he's tired. If you were to just look at a photo of my dogs face right now, he might appear sad, but I know hes just calm and sleepy.
Damn, I cannot wait to have a dog.
Getting a dog should not be an emotional decision. I have a dog and sometimes it's a lot of work. Feeding, pooping, pissing, neverending fur in the house and on my clothes, vet, constant attention seeking etc. Just to mention a few things. And if you need to travel you need a babysitter for your dog. It's easier if you have a backyard where the dog can chill.
I've often equated proper dogcare to childcare-lite.
Want to go out after work? Gotta go home and tend to the dogs first
Weekend getaway? The cost just increased by however much it's going to cost you to board the dogs or hire a sitter.
Surprise! One of your dogs has developed a thyroid condition and will require daily medication for the rest of its life.
Time for that annual teeth cleaning ($$$$$)
That said, next to fatherhood, it's one of the more rewarding things in my life.
Want to go out after work? Gotta go home and tend to the dogs first
Weekend getaway? The cost just increased by however much it's going to cost you to board the dogs or hire a sitter.
Surprise! One of your dogs has developed a thyroid condition and will require daily medication for the rest of its life.
Time for that annual teeth cleaning ($$$$$)
That said, next to fatherhood, it's one of the more rewarding things in my life.
I am fully aware of this, that's why I'm waiting until I own a home to get one. I have two kids.
Good choice. Landlords in most countries can't deny you a lease because of your children.
Thanks for the laugh.
Can confirm. I am sitting here with a 9 week old puppy that I've had since Friday. It's relentless at first.
I feel you. When we got our rescue puppy, we were told he was around 8-9 weeks, but turned out he eas about 6 weeks old when we took him home. He was transferred to a no kill shelter outside of Chicago from a kill shelter in Kentucky. We took him home the day he was transferred. We had to bottle feed for a few weeks with formula before he was able to transition to wet food and them a few weeks later gradually transitioned him to dry food.
I spent about the first week sleeping on the floor next to him to make sure he was comfortable and to take him out if he started whining.
We were also told to expect him to top out around 35 lbs. We had him neutered on Black Friday last year. Figured he was born about May 1st last year. When he got fixed he was already 45 lean pounds. A year after bringing home, he seems to have peaked at 60 pounds, nearly twice what we told to expect. He definitely has tons of energy and is very athletic (he can easily jump entirely over our couch). He could easily clear the baby gates we have to keep him in the living room/kitchen in our townhouse. He did it once without thinking, chasing one our cats upstairs.
First 3 months or so, there were a lot of accidents with urinating and defecating in the house. And he had worms when we first brought him home. I had to carry him up and down the stairs for that period, as well. At firat because he just couldn't get up and down the stairs on his own, and then later to prevent him having an accident before getting outside (never had an accident while I was carrying him).
A year in, he's fairly well trained, but we still have some problem areas like barking and jumping on people. He's crate trained. He sleeps in his crate overnight and when we're away from home for a bit. My wife works from home and sleeps in a bit and he's gotten used to me taking him out early in the morning to do his business and goes right back into his crate on his own after having a bit of food and water until my wife wakes up an hour or so later.
I spent about the first week sleeping on the floor next to him to make sure he was comfortable and to take him out if he started whining.
We were also told to expect him to top out around 35 lbs. We had him neutered on Black Friday last year. Figured he was born about May 1st last year. When he got fixed he was already 45 lean pounds. A year after bringing home, he seems to have peaked at 60 pounds, nearly twice what we told to expect. He definitely has tons of energy and is very athletic (he can easily jump entirely over our couch). He could easily clear the baby gates we have to keep him in the living room/kitchen in our townhouse. He did it once without thinking, chasing one our cats upstairs.
First 3 months or so, there were a lot of accidents with urinating and defecating in the house. And he had worms when we first brought him home. I had to carry him up and down the stairs for that period, as well. At firat because he just couldn't get up and down the stairs on his own, and then later to prevent him having an accident before getting outside (never had an accident while I was carrying him).
A year in, he's fairly well trained, but we still have some problem areas like barking and jumping on people. He's crate trained. He sleeps in his crate overnight and when we're away from home for a bit. My wife works from home and sleeps in a bit and he's gotten used to me taking him out early in the morning to do his business and goes right back into his crate on his own after having a bit of food and water until my wife wakes up an hour or so later.
Yeah the stairs was something I wasn't quite prepared for - I live on the 4th floor and have 60 steps to my garden, I have to carry our pup up and down every 2 hours at the moment (or less if she's eaten recently). She's never peed in her crate or on either of us, which is great but she has done so in the house a few times when we're ever so slightly distracted, but we're getting slightly better at it.
Glad to hear things are working out for you :)
Glad to hear things are working out for you :)
It gets better, but the first weeks are hell. I'm so glad my dog is not a puppy anymore, even though he was really cute.
For me it was the first 3 months. Still a handful and i got more than i bargained for, but one of the better decisions ive made in life.
Think about a cat instead ;)
Seriously, dogs are a shitload of work and especially, no matter how fucked the weather outside is, you gotta take the dog to walks so that the dog can take a dump. In addition, many of the larger breeds are working dogs which means that they require massive amounts of attention and daily exercise so they don't literally go mad. Please do proper research upon the characteristics of your desired breed, and don't take in a rescue dog as your first dog either. Rescue dogs can and will have psychological issues.
Seriously, dogs are a shitload of work and especially, no matter how fucked the weather outside is, you gotta take the dog to walks so that the dog can take a dump. In addition, many of the larger breeds are working dogs which means that they require massive amounts of attention and daily exercise so they don't literally go mad. Please do proper research upon the characteristics of your desired breed, and don't take in a rescue dog as your first dog either. Rescue dogs can and will have psychological issues.
This meme of not getting rescue dogs is so harmful and needs to stop. Good adoption agencies will foster the dogs for a while and let you know if the dog actually has behavioral issues. Plenty of them don't. I'm convinced my rescue's previous owner was a little old lady who died or something. He has no issues at all.
Every time I look at my amazing rescue dog (my first dog ever) and think about how he was almost put to death in a kill shelter it brings me to tears and I'm so happy that I have him.
Every time I look at my amazing rescue dog (my first dog ever) and think about how he was almost put to death in a kill shelter it brings me to tears and I'm so happy that I have him.
Agreed 100%. There's nothing magical about pure bred dogs that makes them behaviorally superior, and furthermore there's a world of breed-specific health issues that come with pure bred dogs, not to mention the difficulty of making sure you're not inadvertently supporting a puppy mill. Any rescue worth their salt will let you do a trial anyways, so if you find out you've got a serial killer on your hands it's not like you're stuck.
Dad's a vet and regularly says he's very thankful for the work purebreds provide. If everyone had mutts, there would be a lot less need for vets.
You're both correct.
It's not purebred vs rescued mutt. It's the age of the dog and whether or not it was mistreated and developed problems that new owners are unlikely to know how to fix.
Young rescues are usually fine.
As you noted, a good rescue agency will do their homework before placing dogs. Not all rescues are good.
And of course, all dogs should be put through a puppy skills course of some sort, even if they're not puppies. Most pet stores and many boarding facilities run classes. They're as much for the owner as the animal.
I've owned three dogs as an adult, the first two from breeders, the 3rd from a rescue. The rescue has had more behavioral issues than the two I raised as puppies. All the behavioral issues are directly linkable to his previous owner (a puppy mill, where he was kept crated most of the day). It's been a TON of work to get him to a point where he's mostly well-adjusted (and I knew going in this would be true). If he had been my first dog, he likely would have been my last as well.
It's not purebred vs rescued mutt. It's the age of the dog and whether or not it was mistreated and developed problems that new owners are unlikely to know how to fix.
Young rescues are usually fine.
As you noted, a good rescue agency will do their homework before placing dogs. Not all rescues are good.
And of course, all dogs should be put through a puppy skills course of some sort, even if they're not puppies. Most pet stores and many boarding facilities run classes. They're as much for the owner as the animal.
I've owned three dogs as an adult, the first two from breeders, the 3rd from a rescue. The rescue has had more behavioral issues than the two I raised as puppies. All the behavioral issues are directly linkable to his previous owner (a puppy mill, where he was kept crated most of the day). It's been a TON of work to get him to a point where he's mostly well-adjusted (and I knew going in this would be true). If he had been my first dog, he likely would have been my last as well.
> Not all rescues are good.
Yes. Any one can call themselves a rescue. And rescues can have a wide variety of beliefs and procedures.
Yes. Any one can call themselves a rescue. And rescues can have a wide variety of beliefs and procedures.
I don't know how to say this without sounding like a jerk, but it's not the tone it's intended in: Getting a dog should not be an emotional decision.
This goes double when it comes to larger or more powerful breeds like ASTs, Dobermans, boxers, etc. A Pomeranian that's bitey is regrettable, a Rottweiler that's bitey is dangerous. Getting a shelter pet is a lot like buying a used car in that you're signing up for a lot of unknowns.
Also, unless you live in a metro area, you're probably limited in your choice of shelters. There is nothing, absolutely nothing, wrong with a reputable pet store (read: one not supplied by puppy mills) or breeder if you're the slightest bit uncomfortable with the shelter or their selection. This also means you're more likely to get a breed that fits your lifestyle and living situation.
This goes double when it comes to larger or more powerful breeds like ASTs, Dobermans, boxers, etc. A Pomeranian that's bitey is regrettable, a Rottweiler that's bitey is dangerous. Getting a shelter pet is a lot like buying a used car in that you're signing up for a lot of unknowns.
Also, unless you live in a metro area, you're probably limited in your choice of shelters. There is nothing, absolutely nothing, wrong with a reputable pet store (read: one not supplied by puppy mills) or breeder if you're the slightest bit uncomfortable with the shelter or their selection. This also means you're more likely to get a breed that fits your lifestyle and living situation.
No offense taken at all and I think this is all great advice. The actual decision to get a dog should be deliberate and thought out. I just hope that people will at least consider shelters / rescues and not rule them out immediately because of what my parent comment said.
> This meme of not getting rescue dogs is so harmful and needs to stop.
I said nothing against rescue dogs, just that it is very, very unwise to adopt one as your first dog with no dog experience prior to it.
> Good adoption agencies will foster the dogs for a while and let you know if the dog actually has behavioral issues.
That's the first thing, how does one find out about the quality of the adoption agency? Plus fostering seems to be a US thing, haven't heard of this in Germany.
> and think about how he was almost put to death in a kill shelter
That's the second problem. Kill shelters are a horrible concept, in Germany this is prohibited by animal welfare laws.
I said nothing against rescue dogs, just that it is very, very unwise to adopt one as your first dog with no dog experience prior to it.
> Good adoption agencies will foster the dogs for a while and let you know if the dog actually has behavioral issues.
That's the first thing, how does one find out about the quality of the adoption agency? Plus fostering seems to be a US thing, haven't heard of this in Germany.
> and think about how he was almost put to death in a kill shelter
That's the second problem. Kill shelters are a horrible concept, in Germany this is prohibited by animal welfare laws.
It is not a meme. Rescue dogs often have issues. While not all, probably >50% in my personal ~10 dog sample size. At 50% it is worth a warning to new dog owners and shouldn't be outright dismissed.
Rescue dogs are usually surrendered because the owner didn't train them. So even excluding any emotional issues, the dog has to be broken of bad habits. A new puppy won't soil where it sleeps, so house training is easy. But a dog that's been locked up most of it's life will, and extra effort in training is needed... not the best for a new dog owner.
Rescue dogs are usually surrendered because the owner didn't train them. So even excluding any emotional issues, the dog has to be broken of bad habits. A new puppy won't soil where it sleeps, so house training is easy. But a dog that's been locked up most of it's life will, and extra effort in training is needed... not the best for a new dog owner.
in LA, i had a good experience adopting my dog last year through the NKLA adoption center (https://nkla.org/) which is organized by https://bestfriends.org/, a national rescue organization.
they told me as much as they could about her from the 10 days they’d had her (for spaying, vaccines, and microchipping) after rescuing her from the county shelter (who found her wandering the streets).
her main behavioral issue was anxiety, probably partially due to prior abuse (she’s cautious around bigger men), which manifested mainly as nervous diarrhea for the first two months, along with panting and self-scratching/gnawing. it took some work to get her to trust me so she could self-regulate her anxiety and calm down at home.
but she’s a bundle of joy, eager to please, very playful & friendly (with dogs & people), and so attuned to me, that i feel immensely lucky to have found her. i wouldn’t trade her for the world!
they told me as much as they could about her from the 10 days they’d had her (for spaying, vaccines, and microchipping) after rescuing her from the county shelter (who found her wandering the streets).
her main behavioral issue was anxiety, probably partially due to prior abuse (she’s cautious around bigger men), which manifested mainly as nervous diarrhea for the first two months, along with panting and self-scratching/gnawing. it took some work to get her to trust me so she could self-regulate her anxiety and calm down at home.
but she’s a bundle of joy, eager to please, very playful & friendly (with dogs & people), and so attuned to me, that i feel immensely lucky to have found her. i wouldn’t trade her for the world!
I've had cats over the years, and currently have 1 cat and 3 dogs (my wife is part of a dog rescue). While cats are easier, IMO they do not give the same emotional reward that dogs give.
You are absolutely right about understanding the breed and the work a dog requires. It makes my wife and I sad whenever we see someone get a 'cute' working dog puppy that requires proper exercise, and then barely letting it outside 2x/day.
Any dog can have psychological issues, so all dogs should be trained. I highly recommend taking a training class with any new dog. The basics are easy, and generally work.
EDIT I wanted to also add that insurance is a good thing to have with a dog. I never want to be in the vet and have to make a medical decision based on cost. My 2 year old dog had to have back surgery and the vet explained that many people just put the dog down when this injury happens even though it's completely fixable and recoverable otherwise.
You are absolutely right about understanding the breed and the work a dog requires. It makes my wife and I sad whenever we see someone get a 'cute' working dog puppy that requires proper exercise, and then barely letting it outside 2x/day.
Any dog can have psychological issues, so all dogs should be trained. I highly recommend taking a training class with any new dog. The basics are easy, and generally work.
EDIT I wanted to also add that insurance is a good thing to have with a dog. I never want to be in the vet and have to make a medical decision based on cost. My 2 year old dog had to have back surgery and the vet explained that many people just put the dog down when this injury happens even though it's completely fixable and recoverable otherwise.
I'd go a step further and say pet insurance is basically a requirement if you want to give your pet a solid existence without needing to hold a big chunk of money in case of emergency. There are few things sadder to me than someone putting an animal down for a fixable issue.
WRT cats, I'd argue that perhaps you just haven't met the right cat. :P I've come to think there's an expectation incongruity at play in that people who are used to dogs are thrown off when a cat wants his/her alone time, whereas a dog is pretty much always "on" socially. Becoming the target of a cat's affection is imo emotionally rewarding in a special way partially because they don't give it away to just anyone.
WRT cats, I'd argue that perhaps you just haven't met the right cat. :P I've come to think there's an expectation incongruity at play in that people who are used to dogs are thrown off when a cat wants his/her alone time, whereas a dog is pretty much always "on" socially. Becoming the target of a cat's affection is imo emotionally rewarding in a special way partially because they don't give it away to just anyone.
> I'd go a step further and say pet insurance is basically a requirement
No argument here. It's saved me a few times now where sudden very large bills would have been hard to stomach.
> WRT cats, I'd argue that perhaps you just haven't met the right cat.
My original comment was too far on one side. I debated how to say it for a few minutes while writing. I had one cat for almost 17 years and he was awesome. My connection with him was just different than with my dogs. But you're right that it is more different than better or worse.
No argument here. It's saved me a few times now where sudden very large bills would have been hard to stomach.
> WRT cats, I'd argue that perhaps you just haven't met the right cat.
My original comment was too far on one side. I debated how to say it for a few minutes while writing. I had one cat for almost 17 years and he was awesome. My connection with him was just different than with my dogs. But you're right that it is more different than better or worse.
In terms of emotional reward it really depends on the cat, I have two, a boy who is about 17lbs (not fat just big) and a little girl who is maybe 7lbs, the boy just does his thing with the occasional headbutting on the way past but the girl, she just wants to sit on my knee all the time, she'll snuggle up across my shoulders and go to sleep (and stay there when I get up for tea), when I'm at home her purr is my constant companion.
We got them really young (rescues) and she just bonded to me from the start :).
We got them really young (rescues) and she just bonded to me from the start :).
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Dogs' eyes don't generally look sad, especially if they're quizzically raising one eyebrow. Why change the title from the much more interesting, and accurate original?
"Dogs’ Eyes Have Changed Since Humans Befriended Them"
I was actually expecting a dire clickbait sort of article, when it actually turns out to be substantive and interesting.
"Dogs’ Eyes Have Changed Since Humans Befriended Them"
I was actually expecting a dire clickbait sort of article, when it actually turns out to be substantive and interesting.
[poster here]: Interesting find - my phone showed the title as 'Why Do Dogs Look So Sad?', where the actual article's title is different. Looking at the page's source code under the <title> tag shows these are different. I chose the shorter version (nevermind dropping the 'so' in 'so sad' cause that's really click-bait-y). My assumption was that readers would know that the source (the Atlantic) is a reputable publication and assume the article is of substance. It's interesting that even the Atlantic needs to resort to changing the title to get those coveted clicks. In the future, i'll strictly post the _actual title_ over to HN submission.
Hm, never knew Atlantic played that game too. I know Ars A/B tests titles, and that a few of the buzzfeed type publications put a social title (ie clickbait fest) for the first day or two while a piece does the rounds of Facebook and Twitter, and replace with a sane "forever" search engine title later.
At the other extreme there's the odd dry-as-dust titled technical article that really needs some editorialising or at least posting on sub-head to have any chance of interest.
At the other extreme there's the odd dry-as-dust titled technical article that really needs some editorialising or at least posting on sub-head to have any chance of interest.
Title changed from "Why do dogs look sad", thanks.
The "Sad" version is in the <title>. That usually means that is the original, and they changed the <h1>.
One of my favorite factoids is that the human-dog symbiosis evolved twice, in two unrelated corners of the world, at around the same time. It was meant to be.
Got a source on that? Seems like an interesting read.
They're talking a lot about the LAOM muscle which raises the eyebrow - I always thought it made dogs look more anxious than sad when they tense it - but they don't really talk about the RAOL muscle much.
> With dogs, Horowitz points out, we’re so driven to connect that we often search for “smiles” in the shapes of dogs’ mouths.
I think a lot of the "smile" facial expression you see on dogs is produced, not by the mouth, but by the RAOL muscle pulling the corners of the eyes out slightly to mimic the way humans' eyes squint slightly when we smile.
In any case, it'd be surprising if dogs didn't have some behavioural / communicative adaptations, given that their role in our lives has historically been a collaborative one. Look at all of the dramatic cosmetic changes we've made in selecting different breeds of dog. Surely selecting for increased utility as a hunting or farming animal would exert even more pressure?
> With dogs, Horowitz points out, we’re so driven to connect that we often search for “smiles” in the shapes of dogs’ mouths.
I think a lot of the "smile" facial expression you see on dogs is produced, not by the mouth, but by the RAOL muscle pulling the corners of the eyes out slightly to mimic the way humans' eyes squint slightly when we smile.
In any case, it'd be surprising if dogs didn't have some behavioural / communicative adaptations, given that their role in our lives has historically been a collaborative one. Look at all of the dramatic cosmetic changes we've made in selecting different breeds of dog. Surely selecting for increased utility as a hunting or farming animal would exert even more pressure?
I wish this article included photos comparing the look of a dog face when using vs not using the cited muscles.
As first reading the title I thought: “Really, that’s very interesting” Then I realized that almost everything about dogs have changed since humans befriended them. They literally went from wolves to pugs. Taking that into consideration it’s not at all surprising that the eyes changed too. Of cause it’s still interesting to dive in exactly how they’ve changed.
> By evolutionary standards, the time since this split [from wolves] has been remarkably short for two new facial muscles to have developed.
2 facial muscles? What about Chihuahuas to Great Danes, is that not a more impressive evolution than 2 facial muscles?
2 facial muscles? What about Chihuahuas to Great Danes, is that not a more impressive evolution than 2 facial muscles?
I think it's because chihuahuas and great danes have all the same bits, just with different scales/shapes. Where as entirely new muscles take a lot more work to evolve.
And bone structure, just forget it. Mammals have mostly the same sets of bones attached the same way--a bat's wings are just gigantic hands with webbed fingers in skeletal terms.
The order all bats are part of, Chiroptera, translates to hand-wing because of this webbed hand wing structure.
I'd be very surprised if Chihuahuas and Great Danes literally have all the same bits. Canines are the most morphologically diverse animal, surpassing even humans. If there aren’t dog breeds that all have or lack a particular muscle, type of hair or bone I’ll be very surprised. Poodles have webbed feet for one, or just consider how some breeds have floppy and others pointed ears.
It’s reasonably likely the muscles that are universal among dogs existed among wolves at very low frequency and just exploded in frequency once they started hanging around humans. These kinds of hard sweeps happen when there’s either a very useful de novo mutation or a new environment makes a previously irrelevant or disadvantageous allele or trait beneficial. In humans think lactase persistence which was pretty much nonexistent 5,000 years ago or the Tibetan altitude adaptations which derive from the Denisovans who were living on the Tibetan plateau over a million years ago.
It’s reasonably likely the muscles that are universal among dogs existed among wolves at very low frequency and just exploded in frequency once they started hanging around humans. These kinds of hard sweeps happen when there’s either a very useful de novo mutation or a new environment makes a previously irrelevant or disadvantageous allele or trait beneficial. In humans think lactase persistence which was pretty much nonexistent 5,000 years ago or the Tibetan altitude adaptations which derive from the Denisovans who were living on the Tibetan plateau over a million years ago.
Floppy ears are just pointed ears that failed to rise - perhaps because they became too big. A German Shepherd pup has floppy ears and they eventually start to stick up, after going through a phase where they can't decide.
There is something impressive that a Chihuahua can instantly somehow recognise the Great Dane or Pekingese as of type dog, even at great distance upwind. Yet can react differently to cat, sheep, fox or squirrel at similar range.
There is something impressive that a Chihuahua can instantly somehow recognise the Great Dane or Pekingese as of type dog, even at great distance upwind. Yet can react differently to cat, sheep, fox or squirrel at similar range.
Did a cursory search and it seems to be common wisdom that all dog breeds have the same number of bones and muscles.
While there are many differences between breeds and individual dogs, there are also common factors that link them together. For example, all breeds have an excellent sense of smell and hearing and have the same number of bones which are tied together by the same number of muscles, tendons and ligaments.
https://breedingbetterdogs.com/article/structure-and-movemen...
While there are many differences between breeds and individual dogs, there are also common factors that link them together. For example, all breeds have an excellent sense of smell and hearing and have the same number of bones which are tied together by the same number of muscles, tendons and ligaments.
https://breedingbetterdogs.com/article/structure-and-movemen...
I’m sure 99% or more of muscles and bones are shared across the various dog breeds but humans have about as much genetic diversity as the average chimpanzee troupe and we have differences in our musculature. For dogs to be more uniform than humans given the speed and vigour of selection seems unlikely. Some breeds should lack vestigial muscles and others have them by more or less random chance.
http://mentalfloss.com/article/91022/5-muscles-you-might-be-...
http://mentalfloss.com/article/91022/5-muscles-you-might-be-...
Where can we find a definitive reference about dogs?
> same number of bones
This seems wrong. What about breeds with significantly different tail lengths?
This seems wrong. What about breeds with significantly different tail lengths?
Think about this: all mammals have the same number of neck vertebrae, 7, from giraffes to humans to mice, with the exception of (some)sloths and manatees.
That being said, dogs will have between 6 and 23 bones in their tails depending on length.
That being said, dogs will have between 6 and 23 bones in their tails depending on length.
Would be great to find some definite information.
Artificial selection versus natural selection. New facial muscles emerging without design or intent is quite different from two separate groups of people trying to see how big/small they can breed a dog to be.
Selective breeding works incredibly fast on evolutionary timescales. You can get a selected population to no overlap with the parent population on your variable of interest in seven generations quite easily.
Selective breeding works incredibly fast on evolutionary timescales. You can get a selected population to no overlap with the parent population on your variable of interest in seven generations quite easily.
They examined four dead wolves. Four. Each had muscle fibers and a tendon at the appropriate place. Just not as pronounced. Where the wolves related? Apparently a pair was obtained from a taxidermist and a pair from Michigan. That is, this is hardly a representative sample of wolves.
Spinning a saga about dog evolution from examining 4 dead wolves is stretching...
Spinning a saga about dog evolution from examining 4 dead wolves is stretching...
I always found dog eyes interesting. Some dogs have eyes that very animal like. I grew up around Miniature Schnauzers and their eyes are eerily human. The biggest difference is that the iris is a little too big. Were it not for that, I'd have a hard time distinguishing their eyes from ours.
I find that to be rather astounding actually. Given the wide variety of expressions Schnauzers at least are capable of emoting, it's pretty amazing how easy it is for two unrelated species to communicate on such a level. They speak a lot with their eyes. Look closely, you'll be amazed.
I find that to be rather astounding actually. Given the wide variety of expressions Schnauzers at least are capable of emoting, it's pretty amazing how easy it is for two unrelated species to communicate on such a level. They speak a lot with their eyes. Look closely, you'll be amazed.
> It’s the first biological evidence scientists have found that domesticated dogs might have evolved a specialized ability used expressly to communicate better with humans.
It could be the other way around: when that kind of ability appeared humans have very selectively decided to prefer dogs that had that trait. Dogs are pretty much a human creation (through centuries of selective breeding) so it's not really evolution rather selection when it comes to this particular example.
It could be the other way around: when that kind of ability appeared humans have very selectively decided to prefer dogs that had that trait. Dogs are pretty much a human creation (through centuries of selective breeding) so it's not really evolution rather selection when it comes to this particular example.
I swear this article was timed perfectly with a top reddit /r/aww post earlier today. Being able to deduce intent and an expression from a dog's glance.
https://www.reddit.com/r/aww/comments/c1qt1x/doggos_polite_a...
https://gfycat.com/healthyfaintbilby
https://www.reddit.com/r/aww/comments/c1qt1x/doggos_polite_a...
https://gfycat.com/healthyfaintbilby
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Direct link to the study referenced: https://www.pnas.org/content/early/2019/06/11/1820653116
Isn't this better described as selective breeding, rather than evolution?
Maybe we haven't consciously bred the trait into dogs, but we might have selected such dogs for breeding, over litter mates that never made eye contact.
Maybe we haven't consciously bred the trait into dogs, but we might have selected such dogs for breeding, over litter mates that never made eye contact.
> objectively cuter
For sure.
For sure.
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1. They can only see blue/yellow. Not like humans' RGB.
2. They are short sighted. For far away objects, their sight is like a T-Rex, they can see moving objects, not stationary objects. Remain still, and they can't see you. Then again, they can smell you, especially if it's downwind.
3. Their flicker fusion threshold is higher than humans. If you show them a cute mobile picture of a baby, they'll see a lot of flickering. As well, did you know lights have a flicker? If you think it's bad, it's even worse for dogs which can lead to stress.
More:
https://dog-vision.com/
https://www.dogwalkersmelbourne.com.au/articles-dog-walking-...