They are generally represented as being strong and tough. In November 2019, the American Bulldog was added to the American Kennel Club (AKC) Foundation Stock Service (FSS). 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. The breed is a light to moderate shedder. Colors, while historically predominantly white with patches of red, black, or brindle, have grown in recent years to include many color patterns including black, red, brown, fawn, and all shades of brindle.