Pit Bull Terrier is a label for a type of dog more than a single breed. It usually covers the American Pit Bull Terrier, American Staffordshire Terrier, Staffordshire Bull Terrier, American Bully and many mixes, all descended from nineteenth-century British bull-and-terrier dogs. DNA studies show shelter labels for these dogs are often wrong, so a dog's size and personality can differ from what the label suggests.
Most are medium-sized, short-coated and muscular, weighing roughly 30 to 65 pounds, and many are affectionate and eager to please. In Irvine, the short coat needs little upkeep, but their strength means a sturdy leash and solid training matter on busy village sidewalks. Because pit bull–type dogs are common in shelters, adopters often meet adult dogs whose personalities are already showing.