Have pit bulls undergone selective breeding?

Yes. There are many breeds derived from the “bull and terrier” dogs of yesteryear, and of course the Bulldogs and various terriers from which the bull-and-terriers derived were selectively bred for centuries if not millennia before that. read more

The best thing we can do for communities and pit bulls is to regulate pit bull ownership and pit bull breeding. Lowering the pit bull population will reduce the number of serious maulings and the euthanasia of pit bulls. read more

Prior to being a stocky fighter, Bull Terriers had a slim curved body and a more chiseled nose, reports Science and Dogs. Over the years, the animals mutated to have a warped skull and thicker abdomen, and it also gained a compulsive tail-chasing trait. read more