From Pekingese to St. Bernard and greyhound, dogs come in such startling variety it's easy to forget they belong to the same species. The profusion of breeds ... dogs are different in form from ...

How did your friendly Fido become so different from his closest living ... In fact, the variation among breeds of dogs is far greater than the variation among other completely distinct species ...

The result is that many modern breeds suffer from ailments that dog lovers never would have deliberately selected for.

Westminster Kennel Club Dog Show features more than 2,500 dogs from around the world competing for the coveted title of Best ...