Pit Bull Terrier is more of a type than a single breed. The label usually covers American Pit Bull Terriers, American Staffordshire Terriers, Staffordshire Bull Terriers, American Bullies and many mixes with broad heads and muscular builds. All trace back to nineteenth-century British bull-and-terrier dogs, and shelter breed labels often don't match DNA results.
Most are medium-sized, short-coated and athletic, usually 30 to 65 pounds. Many are affectionate, eager to please and happiest close to their people, so a dog that joins the household routine tends to do better than one left alone in a yard. Their strength makes training and good manners important, and some are choosy about other dogs, so judge the dog in front of you rather than the label.