Question 1

How accurate is the dog-years formula?

Accepted Answer

It's a widely-used estimate (a dog's first year ≈ 15 human years, its second ≈ +9 more, then a slower size-dependent pace after that) — not a medical or veterinary calculation. Individual dogs vary by breed and health.

Question 2

Why does size matter after age 2?

Accepted Answer

Larger breeds tend to age faster in adulthood than small ones, even though every size follows the same steep curve in the first two years. That's why this calculator asks for a size bucket, not just an age.

Question 3

What if I don't know my dog's exact age?

Accepted Answer

A vet can often estimate age from teeth and general condition at a checkup. In the meantime, your best guess is fine here — this tool is for fun context, not a precise record.

Dog Age Calculator

Common questions