Pit Bull Terrier is more of a type than a single breed. The label covers the American Pit Bull Terrier, the American Staffordshire Terrier, the Staffordshire Bull Terrier, American Bullies and many mixes, all descended from nineteenth-century British bull-and-terrier dogs. Shelter labels for these dogs are often wrong, so a dog's behavior tells you more than its listed breed.
Most are medium-sized, short-coated and muscular, with a broad head and a lot of heart. Many are affectionate, playful and eager to please, and they often want constant closeness. Their strength makes training and good leash habits important, and some are selective about other dogs. Adult dogs are common in this group, so you can often meet a dog whose personality is already visible.