How old is your dog in human years? The old “multiply by 7” rule is wrong — age depends on your dog’s size. Get the accurate answer below.
A dog’s first year equals roughly 15 human years, and the second adds about 9 more. After that, each year counts for 4–7 human years depending on size: small breeds like Chihuahuas age about 4 years per year, while giant breeds like Great Danes age about 7. That’s why a 10-year-old Chihuahua (~56 human years) is “younger” than a 10-year-old Great Dane (~80 human years).
Knowing your dog’s human-equivalent age helps you time vet checkups, adjust food portions (try our Dog Food Calculator), and spot age-related changes early. Most dogs are considered seniors at 7–10 years, smaller breeds later, larger breeds earlier.
This tool gives general estimates only and is not veterinary advice. Always consult your vet about your individual pet. Full disclaimer.