<Tr> <Td_colspan="2"> Domestic dog (Canis lupus familiaris) </Td> </Tr> <P> Pit bull is the common name for a type of dog . Formal breeds often considered in North America to be of the pit bull type include the American Pit Bull Terrier, American Staffordshire Terrier, American Bully, and Staffordshire Bull Terrier . The American Bulldog is also sometimes included . Many of these breeds were originally developed as fighting dogs from cross breeding bull - baiting dogs (used to hold the faces and heads of larger animals such as bulls) and terriers . After the use of dogs in blood sports was banned, such dogs were used as catch dogs in the United States for semi-wild cattle and hogs, to hunt and drive livestock, and as family companions . Despite dog fighting now being illegal in the United States, it still exists as an underground activity, and pit bulls are a common breed of choice . </P> <P> The term pit bull is often used loosely to describe dogs with similar physical characteristics, and the morphological (physical) variation amongst "bully breed" dogs makes it difficult for anyone, even experts, to visually identify them as distinct from "non-pit bulls". While mixed breed dogs are often labeled as "pit bulls" if they have certain physical characteristics such as a square shaped head or bulky body type, visual identification of mixed breed dogs is not recommended by the scholarly community . </P> <P> Pit bulls were created by breeding bulldogs and terriers together to produce a dog that combined the gameness and agility of the terrier with the strength of the bulldog . In the United Kingdom, these dogs were used in blood sports such as bull - baiting and bear - baiting . These blood sports were officially eliminated in 1835 as Britain began to introduce animal welfare laws . Since dogfights were cheaper to organize and far easier to conceal from the law than bull or bear baits, blood sport proponents turned to pitting their dogs against each other instead . Dog fighting was used as both a blood sport (often involving gambling) and a way to continue to test the quality of their stock . For decades afterwards, dog fighting clandestinely took place in small areas of Britain and America . In the early 20th century pit bulls were used as catch dogs in America for semi-wild cattle and hogs, to hunt, and drive livestock, and as family companions . Some have been selectively bred for their fighting prowess . </P>

Where did the term pit bull come from