Every dog owner knows how hard it can be to say no to "puppy-dog eyes," but a new study shines light on how canine facial expressions evolved and why humans are able to understand them so well.

Dogs have evolved face muscles that move much quicker than those of their wolf relatives – which means their faces move in a way reminiscent of human ones. These faster facial muscles allow for better ...

African wild dogs might use facial expressions to communicate with each other as they hunt in packs on the savanna. Arno Meintjes via Flickr under CC BY-NC-SA 2.0 DEED Puppy-dog eyes are irresistible.

Learn symptoms, vet care, and tips to prevent muscle injuries in dogs Reviewed by Alycia Washington Dogs can pull muscles similarly to humans, often resulting in limping or decreased activity due to ...