05/27/2026
Everyone has heard the rule of dog years to human years that tells us that one year of a dog's life is equal to seven years of a human life, but is that accurate?
Kind of....
There ARE variations in how the dog to human years ratio works, and most of them have to do with either the size or the breed of the dog.
Dogs age differently than humans — and similarly, medium and large dogs grow differently than small dogs. In most instances, the smaller dog is expected to have the longer life expectancy, but breed and genetics come into play as well. For example, even if a larger dog lives as long as a small or medium-sized dog, they will spend more years of their life in the geriatric phase than their smaller counterparts.
If you're wondering "How old in human years is my dog?," check out the chart below - but ... Remember, one size does not fit all when it comes to canines and no age calculator for dogs is exact!