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
Dog type on dog types such as "hound" or "terrier". Some group categories cover more than one type; working dog refers to dogs that do some sort of work for humans, in contrast to companion dogs which are pets, although working dogs can also be companions, and companion dogs can do useful work. The terminology is unclear; see Working Group and Utility Group. Mixed-breed dogs can have any combination of working and companion functions and be of any type. Toy dogs are very small dogs of any type. See Toy Group. Ancient dog breeds are modern breeds genetically identified as descending from