1 dog years to human years by size
| Dog size | Human age | Life stage |
|---|---|---|
| Small (20 lb or less) | 15 | young adult |
| Medium (21 to 50 lb) | 15 | young adult |
| Large (51 to 100 lb) | 15 | young adult |
| Giant (over 100 lb) | 12 | young adult |
The old "multiply by seven" rule would say 7. The DNA-based formula from UC San Diego (16 × ln(1) + 31) gives 31. That formula was built on Labradors, so it fits medium and large dogs best.
What 1 looks like for a dog
A one-year-old dog is a teenager. Most have adult teeth and are sexually mature, but many still have puppy energy and test boundaries. Large breeds are still growing.
Frequently asked questions
How old is a 1 year old dog in human years?
Between 15 and 12 human years. Small dogs (under 20 lb) are about 15, medium dogs 15, large dogs 15 and giant breeds 12.
Is a 1 year old dog a senior?
For a small dog, no (young adult). For a large dog it is not yet, and for a giant breed it is not yet.