Pit Bull Terrier is a label more than a single breed. In shelters it usually covers the American Pit Bull Terrier, American Staffordshire Terrier, Staffordshire Bull Terrier, American Bullies and many mixes with broad heads and muscular builds. All trace to nineteenth-century British bull-and-terrier dogs, and DNA tests often disagree with the label a dog arrives with.
Most are medium-sized, short-coated and athletic, weighing roughly 30 to 65 pounds, and many are affectionate, people-focused dogs that want to be near their family. Strength means training and calm, careful introductions matter, and some are selective about other dogs. Because so many are in shelters, adopters can often meet adult dogs whose personalities are already visible, which beats guessing from a puppy's looks.