Average life spans for dogs are closely aligned with genetics, weight and health...sound familiar. AKC standards (not bigger is bigger) could lead to a good life span...weight and diet like humans lends to a good long life...and health/vet care, including oral hygiene will also extend a dogs life. My last Doberman passed due to eating stuffing from a pillow, however she was 7yrs old 75lbs and looked live a 3 year old with the care she received. A friend of ours at the park has a female who is 14 and walking everyday and looks fantastic.... My new girl is only 10 months old and I hope she lasts that long too... ;-)