American Bulldogs descend from working bulldogs that settlers brought to colonial America, where they became farm dogs that caught loose cattle and feral hogs and guarded homesteads. The breed nearly disappeared after World War II before John D. Johnson and Alan Scott revived it. Today there are two broad types: the heavier, shorter-muzzled Johnson or bully type and the leaner, more athletic Scott or standard type, and plenty of dogs fall somewhere between.
Adults weigh roughly 60 to 115 pounds and carry a short, mostly white coat that sheds moderately. Many are devoted, affectionate and protective, with the stamina to match. In Newark, that means early socialization, steady reward-based training and secure handling on busy sidewalks. Many shelter dogs labeled American Bulldog are mixes, so each dog's size and energy can differ from the standard.