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Pit bull is a term used in the United States for a type of dog descended from bulldogs and terriers, while in other countries such as the United Kingdom the term is used as an abbreviation of the American Pit Bull Terrier breed.[1][2][3] The term was first used in 1927.[3] Within the United States the pit bull is usually considered a heterogeneous grouping that includes the breeds American Pit Bull Terrier, American Staffordshire Terrier, American Bully, Staffordshire Bull Terrier and occasionally the American Bulldog, along with any crossbred dog that shares certain physical characteristics with these breeds. In other countries including Britain, the Staffordshire Bull Terrier is not considered a pit bull.[1][4][5] 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.