The Rottweiler is a robust working breed of great strength descended from the mastiffs of the Roman legions. A gentle playmate and protector within the family circle, the Rottie observes the outside world with a self-assured aloofness. A male Rottweiler will stand anywhere from 24 to 27 muscular inches at the shoulder; females run a bit smaller and lighter. The glistening, short black coat with smart rust markings add to the picture of imposing strength. American Kennel Club