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
Drafting dog that could not be cured and were in danger of dying out completely. They were then cross bred with the Newfoundland which did not have the affection. The result gave the St. Bernard a long coat gene as well as the Black and Mahogany colors. The Greater Swiss Mountain Dog, Bernese Mountain Dog, and Rottweiler have personalities that are closely matched. They were watchdogs so the Greater Swiss Mountain Dog and Rottweiler are cautious with strangers yet if socialized with them the dog will like them better. All dog breeds need early socialization and training. All breeds can be gentle