Selective breeding of toy dogs is now resulting in a common condition that can cause skull and brain changes with painful and debilitating effects, a new British study finds. The condition, called ...

Dear reader, I recently wondered why pet dogs come in so many uniquely different shapes, sizes, and colors, while cats look so similar to each other. For instance, Great Danes and Chihuahuas are ...

Humans have a long history of reshaping their canine companions, which evolved from ancient wolves. At least 10,000 years ago, Arctic peoples were using selective breeding to create sled dogs, ...