How old is my dog in Human years?

Published by I Love Veterinary

Updated on

I Love Veterinary blog is reader-supported, and we may earn a commission from products purchased through links on this page, at no additional cost to you. Learn more About Us and our Product Review Process >

Do you know why dogs live less than humans? Well, here are some explanations about why is that so and how to calculate your dog’s years.

How old is my dog in Human years?

  • Science does not sustain the theory 1 human = 7 dog years. Every breed ages differently.
  • Smaller breeds lean to have a longer lifespan than larger breeds. The reasons behind these are still unknown, but a possible cause could be due to the fast growth of large breeds.
  • Some guidelines to calculate dog years to human years:
    • 15 human years = The first year of a medium-sized dog.
    • Add up 9 years to get the second year of a dog.
    • Then, 5 human years would be roughly 5 years for a dog.
  • A 2019 study shared a new formula to calculate dog years to human years based on overtime changes to dogs DNA: human_age = 16ln(dog_age) + 31.

There are projects that continuously work to understand aging in dogs such as the Dog Aging Project

How old is my dog in Human years? infographic

Infographic created by Arais Conde, find out more about her by visiting her Instagram or Portfolio.

Sharing is caring!


Project dedicated to support and help to improve Veterinary Medicine. Sharing information and raising discussions in the veterinary community.


World Veterinary Day

Celebrating World Veterinary Day 2024

5 min read

how long can a dog go without pooping

How Long Can A Dog Go Without Pooping?

9 min read

Subscribe to Our Newsletter

Drop your email below to join I Love Veterinary squad and enjoy regular news, updates, exclusive content, new arrivals and more!