The Staffordshire Bull Terrier, sometimes nicknamed as a Staff, is an English dog breed.It is a medium-sized dog- Originally, it was bred for dog fighting. It is related to the Bull Terrier. Its appearance is similar to the American Staffordshire Terrier and American pit Bull Terrier, but it is smaller than both of them. It grows to a wrist height of 12-17cm and a weight of about 11-17 kg.