The study suggests that excessive breeding of dog breeds by humans has led to changes in the natural structure of dogs' ...

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 today -- at least 150 -- reflects ...

In fact, the variation among breeds ... DNA of dogs and wolves in an attempt to understand the genetic consequences of these species' different lifestyles: domesticated versus wild.

There are hundreds of dog breeds − each with their own personality and temperament. But exactly how many are there? Different kennel clubs across the globe are responsible for registering breeds.