What was the original purpose of the medium to large sized German police dog? 
Police dog:  The most commonly used breeds are the German Shepherd, Belgian Malinois and Rottweiler. Rottweiler: The Rottweiler ( or , ) is a breed of domestic dog, regarded as medium-to-large or large. Rottweiler:  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.
i don't know