Descended from working bulldogs that settlers brought to the colonies, American Bulldogs became all-purpose farm dogs in the South, catching cattle and feral hogs and guarding homesteads. The type nearly vanished after World War II until John D. Johnson and Alan Scott revived it, leaving two styles: the heavier, shorter-muzzled Johnson type and the leaner, more athletic Scott type. Many dogs today blend both, weigh 60 to 115 pounds, and are mostly white.
In Pueblo, that history shows up as stamina and a protective streak. Dogs vary, but most do best with early socialization, reward-based training and a secure yard or a short leash outdoors. Pueblo has no known breed ban, though some landlords and insurers restrict bully-type breeds, so look at housing and insurance terms before bringing one home.