Pit Bull Terrier is more often a type than a single breed. In US shelters the label usually covers the American Pit Bull Terrier, recognized by the United Kennel Club, along with the American Staffordshire Terrier, the Staffordshire Bull Terrier, American Bullies and the many mixed dogs that share their broad heads and muscular bodies. All trace back to nineteenth-century British bull-and-terrier dogs, and DNA studies show shelter breed labels for these dogs are often wrong.
Most dogs adopters meet under this label are medium-sized, short-coated, strong and athletic, and many are enthusiastic, affectionate and eager to please with their people. Their strength means training, socialization and good management matter, and some are selective about other dogs. Because pit bull–type dogs are among the most common in shelters, adopters have many adult dogs to choose from whose individual temperament is already known.