The Giant Ratzer is a combination of a Giant Schnauzer and a Rat Terrier. The Giant Schnauzer was developed in Germany as one of the three distinct Schnauzer breeds, Miniature, Standard and Giant. The Giant Schnauzer is thought to have been created by crossing the Standard Schnauzer with the black Great Dane and possibly the Bouvier des Flandres. Often found working in breweries as guard dogs, they were also bred as farm dogs. In Germany, they were used by the police and as military dogs in both world wars and are still used as working dogs today. Giant Schnauzers first arrived in America in the 1930s and were registered by the American Kennel Club in 1930. The Giant Schnauzer Club of America was founded in 1962. Not surprisingly, the Rat Terrier was bred for catching rats and other small vermin mostly on farms. It is an American breed and was developed from Fox Terriers, Old English White Terriers, Manchester Terriers, Bull Terriers and was later crossed with Beagles, Whippets, and Italian Greyhounds among others. Some believe President Theodore Roosevelt named the breed when his dog sorted out the rat problem in the White House. The Teddy Roosevelt Terrier is also known as the short-legged Rat Terrier. Today, the Rat Terrier is a companion pet but also a working dog used as service dogs in hospices and as police dogs. In 1972, the first hairless Rat Terrier was born. The hairless Rat Terrier is known as the American Hairless Terrier and is either miniature or standard. There is also a larger strain, called the Decker or Decker Giant, named after breeder Milton Decker. The Rat Terrier was officially recognized by the American Kennel Club in 2013.