Dog Age Calculator
Convert your dog's age to human years using modern research. Size matters—larger dogs age faster than smaller breeds.
Enter your dog's age to see the human equivalent.
How It Works
The old "7 years per human year" rule is too simple. Dogs mature rapidly in their first two years (15 + 9 human years), then age at different rates based on size. Larger breeds age faster because their bodies work harder to support their size.
Frequently Asked Questions
Why do small dogs live longer?
Scientists aren't entirely sure, but larger dogs may age faster due to accelerated cell growth, higher metabolic demands, and greater strain on organs. Giant breeds can be considered senior at 6-7 years while small breeds stay young until 10-12.
When is my dog a senior?
It varies by size. Giant breeds: 5-6 years. Large breeds: 7-8 years. Medium breeds: 8-9 years. Small breeds: 10-11 years. Senior dogs benefit from more frequent vet visits and adjusted nutrition.
How can I help my dog age well?
Regular exercise, healthy weight, dental care, mental stimulation, and annual vet checkups all contribute to longevity. Quality nutrition appropriate for their life stage is essential.