The American Bulldog descends from working bulldogs that came to the American South with colonial settlers and spent generations catching cattle and hogs and guarding farms. The breed nearly vanished after World War II before John D. Johnson and Alan Scott helped revive it. Dogs range from the heavier, shorter-muzzled Johnson type to the leaner, more athletic Scott type, and many are a mix of both, weighing roughly 60 to 115 pounds.
That background shows up as a dog that wants a job and its family close by. Many are affectionate and goofy at home, watchful with strangers and selective with other dogs. Early socialization, reward-based training, a sturdy leash and a secure fence all matter for a dog this strong. Shelters also label many mixes as American Bulldogs, so size and energy vary from dog to dog.