 This is true in Germany to this day.It is only by testing the working ability of every generation that the strong working characteristics of the GSD have been maintained.Dogs of any breed, even mixes, can compete in Schutzhund today, but the most common breeds are German Shepherds, Belgian Malinois, Boxers, Rottweilers, Dobermans, Cane Corso, Giant Schnauzers, Bouvier des Flandres, Dutch Shepherd Dogs, Beaucerons, American Bulldogs, Black Russian Terriers, Airedale Terriers, Australian Cattle Dogs, and the like.