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 than hounds, working dogs, toy dogs and non-sporting dogs. The sporting dogs were more trainable than non-sporting dogs. Terriers were bolder than hounds and herding dogs. Breeds with ancient Asian or African origin were less trainable than breeds in the herding/sighthound cluster and the Hunting breeds. Breeds in the mastiff/terrier cluster were bolder than the ancient breeds, the breeds in the herding/sighthound cluster, and the hunting breeds. Today, dog breeds are often categorized by the ancestral type and subtype from which the breed descended. In addition, dog breed groups, which kennel clubs use to organize breeds of dogs, are based