The American Bulldog is a large, muscular breed of mastiff-type that were used as stock dogs, catch dogs, and guardians on farms and ranches. They are descended from the Old English Bulldog, which is thought to have arrived in America as early as the 17th century, brought over by working-class immigrants from England. During WWI and WWII, the breed was on the verge of extinction, with the only surviving dogs being kept primarily on farms in the southeast. John D. Johnson and Alan Scott are widely regarded as the forefathers of rescuing the breed from extinction.
On January 1, 1999 the United Kennel Club first recognized the American Bulldog. In November 2019, the American Bulldog was added to the American Kennel Club (AKC) Foundation Stock Service (FSS).