The Rottweiler, or Rottweil Metzgerhund, is a large dog breed originating in Germany as herding dogs. It is a hardy and very intelligent breed. Early Rottweilers worked as beasts of burden, carrying wood and other products to market. During the first and second World Wars, Rottweilers were put into service as war time guard dogs. Currently they are frequently used as guard and police dogs. The Rottweiler was first recognized by the American Kennel Club in 1931.