How Old Is My Dog In Human Years? When trying to calculate your dog’s age in human years, you need to take both breed and size into consideration.
Larger dogs generally grow more slowly but tend to have shorter lives than smaller breeds. Mixed breeds generally have longer life expectancies than pure breeds. And castrated dogs on average live 1 year longer than non-castrated animals.
The rule of thumb used to be that 1 dog year was the equivalent to 7 human years. But more recent findings give us a new way to calculate a dog’s age. The following table provides a relatively easy way to calculate an individual dog’s age:
Translating Dog Years into Human Years
| Dog’s age | Small breed – age in human years | Medium breed – age in human years | Large breed – age in human years |
| 1 | 15 | 15 | 15 |
| 2 | 24 | 24 | 24 |
| 3 | 28 | 28 | 28 |
| 4 | 32 | 32 | 32 |
| 5 | 36 | 36 | 36 |
| 6 | 40 | 42 | 45 |
| 7 | 44 | 47 | 50 |
| 8 | 48 | 51 | 55 |
| 9 | 52 | 56 | 61 |
| 10 | 56 | 60 | 66 |
| 11 | 60 | 65 | 72 |
| 12 | 64 | 69 | 77 |
| 13 | 68 | 74 | 82 |
| 14 | 72 | 78 | 88 |
| 15 | 76 | 83 | 93 |
| 16 | 80 | 87 | 120 |
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