The Rottweiler is a breed of domestic dog, regarded as medium-to-large or large. The dogs were known in German as Rottweiler Metzgerhund, meaning Rottweil butchers' dogs, because their main use was to herd livestock and pull carts laden with butchered meat to market.

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. A thickly muscled hindquarters powers the Rottie's effortless trotting gait. A well-bred and properly raised Rottie will be calm and confident, courageous but not unduly aggressive. The aloof demeanor these world-class guardians present to outsiders belies the playfulness, and downright silliness, that endear Rotties to their loved ones. (No one told the Rottie he's not a toy breed, so he is liable plop onto your lap for a cuddle.) Early training and socialization will harness a Rottie's territorial instincts in a positive way.