"Pitbull"

Pit bull is an umbrella term for several types of dog believed to have descended from bull and terriers. In the United States, the term is usually considered to include the American Pit Bull Terrier, American Staffordshire Terrier, American Bully, Staffordshire Bull Terrier, and sometimes the American Bulldog, along with any crossbred dog that shares certain physical characteristics with these breeds. In other countries, including the United Kingdom, the term is used specifically for the American Pit Bull Terrier, excluding the Staffordshire Bull Terrier. Most pit bull–type dogs descend from the British bull and terrier, a 19th-century dog-fighting type developed from crosses between the Old English Bulldog and the Old English Terrier.

Pit bull
A selection of dog breeds sometimes classified as pit bull types. Clockwise from top left: American Pit Bull Terrier, American Staffordshire Terrier, American Bulldog, Staffordshire Bull Terrier.
Origin	United States, Great Britain
Dog (domestic dog)

Pit bull–type dogs have a controversial reputation as pets internationally, due to their history in dog fighting, the number of high-profile attacks documented in the media over decades, and their proclivity to latch on while biting. Proponents of the type and advocates of regulation have engaged in a highly contentious nature-versus-nurture debate over whether aggressive tendencies in pit bulls may be appropriately attributed to owners' poor care for and competency to handle the dog or inherent qualities owing to their breeding for fighting purposes. While some studies have argued that pit bull–type dogs are not disproportionately dangerous, offering competing interpretations on dog bite statistics, independent North American organizations have published statistics from hospital records showing pit bulls are responsible for more than half of dog bite incidents among all breeds, despite comprising only 6% of pet dogs. Some insurance companies will not cover pit bulls (along with Rottweilers and wolf hybrids) because these particular dogs cause a disproportionate rate of bite incidents. Dog bite severity varies by the breed of dog, and studies have found that pit bull–type dogs have both a high rate of reported bites and a high rate of severe injuries, compared to other non–pit bull–type dogs.

Pit bull–type dogs are extensively used in the United States for dog fighting, a practice that has continued despite becoming illegal. Several nations and jurisdictions restrict the ownership of pit bull–type dogs through breed-specific legislation. A pro–pit bull lobby exists that promotes pit bulls as family pets, advocates for and funds pit bull research, and opposes laws that regulate their ownership.