The Pit Bull represents the most commonly used informal name for the American Pit Bull Terrier, a breed whose identity has been shaped by its working heritage and complex history in American society. This powerful, athletic dog has accumulated numerous alternative names throughout its development, reflecting the various strains that emerged from original bull-and-terrier crosses brought to America from the British Isles during the nineteenth century.
The term Pit Bull derives from the fighting pits where the breed's ancestors competed in blood sports after bull-baiting and bear-baiting were outlawed in Britain in 1835. Underground fighting arenas known as pits became venues for dog fighting and ratting competitions, giving rise to the 'Pit Bull' designation that persists today. While these activities have long been illegal throughout the United States and most of the world, the name endures as a recognizable reference to this athletic and powerful breed. The colloquial use of 'Pit Bull' has expanded beyond the American Pit Bull Terrier to encompass related breeds and mixed-breed dogs sharing similar physical characteristics.
Other common names and abbreviations for this breed include APBT, the official acronym recognized by major registries, and affectionate terms like Pittie, Pitty, and Pibble used by enthusiasts and advocates. Some owners prefer the shortened form Pit when referring to their dogs in casual conversation. These informal names reflect the breed's popularity and the affection owners hold for their companions despite ongoing public perception challenges.
The breed is also known by strain-specific names that reflect particular bloodlines and breeding programs developed over more than a century. The Old Family Red Nose, abbreviated OFRN, refers to a distinctive strain originating from Irish imports, characterized by copper-red coloration including red noses, amber eyes, red lips, and red toenails. The Colby dogs represent another historically significant bloodline, developed by John Pritchard Colby beginning in 1889 from premier fighting dogs imported from England and Ireland. Colby's Pincher became one of the most influential stud dogs in breed history, appearing in the pedigrees of countless modern Pit Bulls. The Blue Nose Pit Bull refers to dogs displaying blue-gray coat coloration, though this describes a color variant rather than a distinct bloodline.
In terms of formal recognition, the Pit Bull occupies a unique position among purebred dogs. The United Kennel Club became the first registry to recognize the breed in 1898 when founder Chauncey Z. Bennett assigned registration number one to his own dog, Bennett's Ring. The American Dog Breeders Association, established in 1909, also registers the breed and maintains its own standard focused on athletic conformation. However, the American Kennel Club does not recognize the American Pit Bull Terrier, instead registering the closely related American Staffordshire Terrier, which shares common ancestry but has been bred to different standards since 1936.
The relationship between Pit Bulls and American Staffordshire Terriers remains debated within the dog community. For decades, dogs could be dual-registered with both the UKC as American Pit Bull Terriers and with the AKC as American Staffordshire Terriers. Since 2015, the ADBA has classified these as separate breeds based on divergent breeding goals and resulting differences in conformation and temperament. Internationally, the Federation Cynologique Internationale does not recognize the Pit Bull. The breed also faces legal restrictions in numerous countries where pit bull-type dogs are regulated or prohibited under breed-specific legislation, including complete bans in the United Kingdom under the Dangerous Dogs Act of 1991.

