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.
Compared to the measly five million aroma receptors embedded in human nasal tissue, which is about the size of postage stamp, some dogs have over 200 million receptors that are embedded in a sheet of tissue that, unfolded, would be big enough to cover one-third of the dog’s surface area.
Until recently, scientists believed that domestic dogs originated in the Middle East. But reports suggest that almost all domestic dogs began in East Asia as the offspring of three lineages. Virtually all domesticated dogs in the United States descend from dogs brought over by ancient people that crossed the Bering land bridge from Asia to North America.
Since dogs descended from wolves, researchers who have studied wolves think that they roll in strong-smelling stuff to mask their scent.