Dog have died and half are still alive, ranges from 10 to 13 years. Individual dogs may live well beyond the median of their breed. The breed with the shortest lifespan (among breeds for which there is a questionnaire survey with a reasonable sample size) is the Dogue de Bordeaux, with a median longevity of about 5.2 years, but several breeds, including Miniature Bull Terriers, Bloodhounds, and Irish Wolfhounds are nearly as short-lived, with median longevities of 6 to 7 years. The longest-lived breeds, including Toy Poodles, Japanese Spitz, Border Terriers, and Tibetan Spaniels, have median longevities of 14 to 15
Schnauzer as the modern Standard Schnauzer breed and was bred as a rat-catcher and guard dog. 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. By the VDH and FCI Schnauzer is placed in "", with "Nr. 181, 182 and 183" in "Section 1.2: Schnauzer" dedicated to all three Schnauzer breeds. In 2004 population genetics study of 85 purebred dogs, which used cluster-based methods with 4 identified genetic clusters, all three Schnauzer breeds structurally mostly clustered within "recent