Dog Age Calculator by Breed
Find your dog’s human age based on breed size
Dog Age (years)
Breed / Size Category
Dog Age by Breed: Why Size Matters
A Chihuahua and a Great Dane at the same age are at very different life stages. Our dog age calculator by breed applies size-specific aging rates so you get an accurate human-year equivalent for your dog’s specific breed category.
Dog Breeds by Size Category
| Size | Weight | Breed Examples | Life Expectancy |
|---|---|---|---|
| Small | Under 20 lbs | Chihuahua, Shih Tzu, Pomeranian | 12-16 years |
| Medium | 20-50 lbs | Beagle, Cocker Spaniel, Border Collie | 10-13 years |
| Large | 50-90 lbs | Labrador, German Shepherd, Husky | 8-12 years |
| Giant | 90+ lbs | Great Dane, Mastiff, Saint Bernard | 6-10 years |
FAQs
How old is a 7-year-old Labrador in human years?
A 7-year-old Labrador (large breed) is approximately 54 human years. At this age, Labradors are entering their mature/senior stage and benefit from bi-annual vet visits, joint supplements, and weight management.
How old is a 5-year-old Chihuahua in human years?
A 5-year-old Chihuahua (small breed) is approximately 38 human years — firmly in their prime adult years with many healthy years ahead.
Conclusion
Our dog age calculator by breed gives you the most accurate human-year equivalent for your specific breed size. For full age conversion charts, use our dog age calculator. Pair with our food calculator for breed-size appropriate nutrition.