The American Pit Bull Terrier (APBT) is a dog breed. It is a medium-sized, solidly-built, short-haired dog whose early ancestors came from the British Isles. A member of the molosser breed group, both the American Staffordshire Terrier and the American Pit Bull Terrier (APBT) were bred from the same lineage, but received different names from the two American kennel clubs; Staffordshire was the name given by the American Kennel Club (AKC), and American Pit Bull Terrier by the United Kennel Club (UKC). When compared with the English Staffordshire Bull Terrier (another breed within the type commonly called pit bulls), the American Pit Bull Terrier is larger by margins of 6–8 inches (15–20 cm) in height and 25–35 pounds (11–16 kg) in weight.