The American Bully is a modern breed of dog that was developed as a companion dog, and originally standardized and recognized as a breed in 2004 by the American Bully Kennel Club (ABKC). Their published breed standard describes the dog as giving the "impression of great strength for its size". In 2008, the American Bully was recognized by the European Bully Kennel Club (EBKC), and on July 15, 2013, by the United Kennel Club (UKC).[1] The UK Kennel Club, American Kennel Club, and International Canine Federation do not recognize the American Bully as a separate breed.[2][3][4]

Temperament in adult dogs is highly dependent on training, and the breed can be very demanding and needs to be properly trained. The American Bully Kennel Club divided the American Bully into four categories, including the XL, Pocket, Standard, and Classic, whereas other registries, including the UKC, have approved one consistent size standard.