On average small dogs live longer than large dogs. Genetics significantly influence length of life.
Many tiny dogs live 14-16 years. The longest living dog was a toy poodle who reached 20 years old.
Dogs 20-50 lbs often reach 12-15 years old, like beagles, American Eskimo dogs, and cairn terriers.
Big dogs over 90 lbs average 7-10 years depending on breed, such as labs or mastiffs.
Neutering/spaying, healthy weight, exercise, genetics, and veterinary care promote longevity.
Use age conversion calculators to compare dog years vs human years based on breed size averages.
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Some exceptional dogs defy size odds and live over 20 years with great veterinary and home care.