If a dog is 7 years old in years. How it human years?

There's no single, perfect conversion for dog years to human years. It depends on the dog's breed and size. However, a common estimate is:

* First year: 15 human years

* Second year: 9 human years

* Every year after: 4 human years

Here's how to calculate it for a 7-year-old dog:

* First year: 15 human years

* Second year: 9 human years

* Years 3-7: 5 years * 4 human years/year = 20 human years

Total: 15 + 9 + 20 = 44 human years

So, a 7-year-old dog is roughly equivalent to a 44-year-old human. Keep in mind this is just an estimate!