| Dog age | Small | Medium | Large | Giant |
|---|---|---|---|---|
| 1 | 15 | 15 | 15 | 12 |
| 2 | 24 | 24 | 24 | 22 |
| 3 | 28 | 28 | 28 | 31 |
| 4 | 32 | 32 | 32 | 38 |
| 5 | 36 | 36 | 36 | 45 |
| 6 | 40 | 42 | 45 | 49 |
| 7 | 44 | 47 | 50 | 56 |
| 8 | 48 | 51 | 55 | 64 |
| 9 | 52 | 56 | 61 | 71 |
| 10 | 56 | 60 | 66 | 79 |
| 11 | 60 | 65 | 72 | 86 |
| 12 | 64 | 69 | 77 | 93 |
| 13 | 68 | 74 | 82 | 100 |
| 14 | 72 | 78 | 88 | 107 |
| 15 | 76 | 83 | 93 | 114 |
| 16 | 80 | 87 | 99 | 121 |
Size classes are based on adult weight: small is 20 lb or less, medium 21 to 50 lb, large 51 to 100 lb, and giant over 100 lb.
Key takeaways
- Every dog is roughly a teenager at 1 and in its twenties at 2.
- After age 5, the size gap widens fast: at 10, a small dog is about 56 and a giant dog about 79.
- Senior care should start earlier for bigger dogs, around 6 for giants and 8 for large breeds.
For an exact figure, including months, use the dog age calculator.
Frequently asked questions
How do you read a dog age chart?
Find your dog’s age in the first column and its adult weight class across the top. A 6-year-old 60 lb Lab, for example, is about 45 in human years.