10 dog years to human years by size
| Dog size | Human age | Life stage |
|---|---|---|
| Small (20 lb or less) | 56 | senior |
| Medium (21 to 50 lb) | 60 | senior |
| Large (51 to 100 lb) | 66 | senior |
| Giant (over 100 lb) | 79 | senior |
The old "multiply by seven" rule would say 70. The DNA-based formula from UC San Diego (16 × ln(10) + 31) gives 68. That formula was built on Labradors, so it fits medium and large dogs best.
What 10 looks like for a dog
Ten is senior for nearly every dog. Vision, hearing and memory can start to fade. Simple brain games and routine help.
Frequently asked questions
How old is a 10 year old dog in human years?
Between 56 and 79 human years. Small dogs (under 20 lb) are about 56, medium dogs 60, large dogs 66 and giant breeds 79.
Is a 10 year old dog a senior?
For a small dog, no (senior). For a large dog it is yes, and for a giant breed it is yes.