Almost all domestic and wild dogs show this behavior as they prepare to curl up and lie down, but there have been almost no experiments to find out why.
Why do dogs seem to gulp down any and all food put in front of them?
It might seem like an obvious question, but what really makes humans different from some of our four legged friends? Learn more on this Moment of Science.
Domesticated cats tend to show much less variety. A Siamese and a tabby are both shaped like, well, cats. While there are many different breeds of dogs.
If you have a dog, you may have noticed that sometimes it seems to be smiling. Of course, we know that dogs don't really smile, right?
Dog-human attentiveness may mean that dogs make better subjects to study cognitive skills than primates, even chimpanzees, our closest genetic relatives.
I'm not saying dogs weren't intelligent creatures in their distant past, before they were domesticated, but now wolves are much smarter than dogs.
As you may have noticed, your dog probably treats each walk as an adventure-packed expedition through the Amazonian wilds. What’s up with the constant sniffing of every patch of sidewalk, tuft of grass, and length of stop sign? Learn more on this Moment of Science.
Is your dog suffering from obsessive compulsive disorders? Find out on this Moment of Science.
Have you ever wondered why dogs bark? Find out on this Moment of Science.