The American Pit Bull Terrier is a dog breed recognized by the United Kennel Club and the American Dog Breeders Association, but not the American Kennel Club. It is a medium-sized, short-haired dog, of a solid build, whose early ancestors came from England. When compared with the English Staffordshire Bull Terrier, the American Pit Bull Terrier is larger by margins of 6–8 inches in height and 25–35 pounds in weight. The American Pit Bull Terrier varies in size: males are normally about 18–21 inches in height and around 35–60 pounds in weight, while females are normally around 17–20 inches in height and 30–50 pounds in weight.