The AKC added the American Bulldog to the FSS on November 11, 2019. The American Bulldog is a stocky, well built, strong-looking dog, with a large head and a muscular build. The shoulders and chest tend to be the most muscular parts of the American Bulldog. Many modern American Bulldogs are a combination of the two types, usually termed 'hybrid.' In general, American Bulldogs weigh between 27 and 54 kg (60 to 120 lb) and are 52 to 70 cm (20 to 28 in) at the withers, but have been known to greatly exceed these dimensions, especially in the 'out of standard,' nonworking stock.