Free tool
Find out how old your dog really is in human years, adjusted for breed size.
Enter a value between 1 and 20
Breed size
Result
28
human years
A 3-year-old medium dog is roughly equivalent to a 28-year-old human, in the young adult stage of life.
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Golden Retriever
large breed
Labrador Retriever
large breed
German Shepherd
large breed
Poodle
large breed
Beagle
medium breed
Dachshund
small breed
Boxer
large breed
Shih Tzu
small breed
Chihuahua
small breed
Siberian Husky
medium breed
Border Collie
medium breed
Australian Shepherd
medium breed
Corgi
medium breed
Rottweiler
large breed
Great Dane
giant breed
Dogs mature much faster than humans in early life. A 1-year-old dog is sexually mature and roughly equivalent to a 15-year-old human, not a 7-year-old. The formula also ignores that large breeds age faster than small breeds.
Yes, significantly. Small dogs (under 20 lbs) commonly live 14 to 16 years. Giant breeds (over 90 lbs) often live only 8 to 10 years. The same chronological age represents a very different life stage depending on size.
We use the AKC/AVMA-aligned age chart that accounts for breed size categories: small, medium, large, and giant. These figures are derived from veterinary practice standards.
Absolutely. Very old dogs are rare but they do exist. Small and toy breeds are the most likely to reach 15+ years. At those ages, human-year equivalents are estimated based on extrapolation of the same curve.