From tiny Chihuahuas to energetic beagles, some dogs are simply built to go the distance, a veterinarian told Newsweek.

Modern pet dogs are not just changing on the outside, with ever more specialized shapes and sizes, they are also quietly ...

Humans began selectively breeding dogs around 2,000 years ago, and these genes play a role in your pup's behavior, a new study of 4,000 purebred, mixed-breed and wild dogs finds. When you purchase ...

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 ...