The cynologists believe that the Giant Schnauzer was developed independently through crosses of black Great Danes, Munchener German Shepherds, Rottweilers, Dobermans, Boxers, Bouvier des Flandres, Thuringian Shepherds, and the Standard Schnauzer. They are working dogs that were developed in Swabia in the 17th century, once known as the Munich Schnauzer, originally bred to drive livestock to market and guard farms, and later used as police and military dogs. Giant Schnauzers (also known as Riesenschnauzers) are around 2 ft (61 cm) tall at the shoulder and weigh between 55 and 80 lb (25 and 36 kg).It is considered to have a common ancestry with the German Pinscher as a wire-haired coated variant of the Pinscher breed, and was possibly crossed with black German Poodle and gray Wolf Spitz, to which influence is attributed the black soft coat and the salt-and-pepper gray wiry coat. They are in the group of working dogs, bred as multifunctional dogs to catch rats and other rodents, as livestock and guard dogs, and later they have also carried messages in times of war, helped the Red Cross and been police dogs. Standard Schnauzers (also known as Mittelschnauzers) are around 1.5 ft (46 cm) tall at the shoulder and weigh 30 to 45 lb (14 to 20 kg).

181, 182 and 183' in 'Section 1.2: Schnauzer' dedicated to all three Schnauzer breeds. By the VDH and FCI Schnauzer is placed in 'Group 2, Section 1: Pinschers and Schnauzers', with 'Nr. The Giant Schnauzer and the Miniature Schnauzer were developed from the Standard Schnauzer and are the result of outcrosses with other breeds exhibiting the desirable characteristics needed for the Schnauzer's original purpose. The original Schnauzer was of the same size as the modern Standard Schnauzer breed and was bred as a rat-catcher and guard dog. Toy and teacup are not breeds of Schnauzer, but these common terms are used to market undersized or ill-bred Miniature Schnauzers. There are three breeds: the Standard, the Giant, and the Miniature.

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