There can be some confusion over the term "pit bull" as it refers to more than one breed. According to the ASPCA, the most accurate definition of the term is to describe one of two breeds: the American pit bull terrier and the American Staffordshire terrier. Of these breeds, the American pit bull terrier is the larger.
According to United Kennel Club standards, male American pit bull terriers should weigh between 35 and 60 pounds and measure between 18 and 21 inches to the shoulder, whereas females should weigh between 30 and 50 pounds and measure between 17 and 20 inches. American Staffordshire terriers are smaller, should ideally weigh 24 to 38 pounds and should measure 14 to 16 inches at the shoulder, state American Kennel Club breed standards.