American Staffordshire Terriers descend from bull-and-terrier dogs brought from Britain in the 1800s. The American Kennel Club recognized the breed in 1936. AmStaffs are muscular, medium-sized dogs, usually 40 to 70 pounds, with a broad head, pronounced cheeks and a short, glossy coat in almost any color.
Most AmStaffs are confident, affectionate and playful with their people, and many love leaning on or climbing onto a favorite person. They're also strong and determined, so they do best with consistent training and careful introductions to other dogs. Some are selective with other dogs even when well socialized. Dogs vary, and breed alone doesn't decide how any one dog behaves at home.