The American Bully is a relatively new breed that was first developed in the United States in the 1990s. While there is no one “official” way to tell if a dog is a purebred American Bully, there are some general characteristics that are common to most dogs of this breed.American Bullies should have a large, muscular build with a wide chest and thick neck. Their head should be large and blocky, with pronounced cheeks and a short muzzle. Their ears may be cropped or left natural; if left natural, they should be small and triangular in shape. The coat of an American Bully can be short or medium in length and any color or combination of colors is acceptable.
There are several registry organizations for American Bullies, but not all of them require DNA testing for dogs to be registered as purebreds. However, if you are looking for confirmation that your dog is indeed a purebred American Bully, you can always have him tested through one of the many commercial dog DNA testing companies.