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DogsDog Age Chart by Breed Size: Small, Medium, and Large
2026-08-07
One of the most common questions dog owners ask is: how old is my dog in human years? The answer depends heavily on your dog's breed size.
Small Dogs (0-20 lbs / 0-9 kg)
Small breeds like Chihuahuas, Pomeranians, and Yorkies tend to live the longest. Here's their age conversion:
| Dog Age | Human Years |
|---|---|
| 1 | 15 |
| 2 | 24 |
| 3 | 28 |
| 5 | 36 |
| 7 | 44 |
| 10 | 56 |
| 15 | 76 |
Medium Dogs (21-50 lbs / 10-23 kg)
Medium breeds like Beagles, Border Collies, and Cocker Spaniels fall in the middle:
| Dog Age | Human Years |
|---|---|
| 1 | 15 |
| 2 | 24 |
| 3 | 28 |
| 5 | 36 |
| 7 | 47 |
| 10 | 60 |
| 15 | 74 |
Large Dogs (51+ lbs / 24+ kg)
Large breeds like Labradors, German Shepherds, and Golden Retrievers age faster in their senior years:
| Dog Age | Human Years |
|---|---|
| 1 | 15 |
| 2 | 24 |
| 3 | 28 |
| 5 | 36 |
| 7 | 47 |
| 10 | 66 |
| 15 | 93 |
Key Takeaway
Notice how all sizes start the same (15 at year 1, 24 at year 2), but diverge significantly in later years. A 15-year-old small dog is 76, while a large dog the same age is 93 — a 17-year difference!
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