The Giant Schnauzer is a working breed of dog developed in the 17th century in Germany. It is the largest of the three breeds of Schnauzer, with the other two breeds being the Standard Schnauzer and the Miniature Schnauzer. Numerous breeds were used in its development, including the black Great Dane, the Bouvier des Flandres, and the Standard Schnauzer. Originally bred to assist on farms by driving livestock to market and guarding the farmer's property, the breed eventually moved into the city, where it worked guarding breweries, butchers' shops, stockyards and factories. It was unknown outside of Bavaria until it became popular as a military dog during World War I and World War II.
They have dense, curly fur that protects them from the weather and from vermin. Giant Schnauzers come in two color patterns: Solid black, and a color known as salt and pepper, where white, black, and gray hairs speckle the dog at random. Where legal, they are shown with cropped ears and docked tails. Like other schnauzers, they have a distinct beard and eyebrows. Today, the Giant Schnauzer participates in numerous dog sports, including Schutzhund. It is also used as a police dog.