We know the old rule of thumb, one year for a human is 7 dog years. Well, not so fast. How many 100 year old humans can run laps around you? Here is a quick reference guide to calculate what stage of life your dog may be in.
The chart below, use these general ranges for dog size: Small dog = 20 pounds or less Medium dog = 21-50 pounds Large dog= More than 50 pounds
| Dog's Age | Age in Human Years | ||
| Small breed | Medium breed | Large breed | |
| 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 |
After 14 years of age, who knows? Its probably safe to say that if you have a small to medium breed dog, 15-16 years is like 90, and 17 or more years is like a 100. For a large breed, 15 years is like 90, and 16 + is like a 100. There is no exact way, but hopefully this correlates a little closer to human life spans, and provides you with a little more knowledge when looking at your dogs activity and health level.
