How Old is 5 in Dog Years?

5 in dog years roughly equals 36 in human years.

This calculation was made for a medium-sized dog (21 to 50 pounds) using the recommendations from the AKC (American Kennel Club).

There are 2 ways of calculating the conversion from human years to dog years. The above result was calculated using the more correct way, we’ll explain what makes the other way incorrect later in this article.

The table below shows dog years and their equivalent to human years, with different columns for different sizes.

Dog's Age in YearsHuman Years (Small Dog)Human Years (Medium Dog)Human Years (Large Dog)

5 in dog years

Calculating how many human years is 5 in dog years

As mentioned above, there are 2 main ways of calculating dog years to human years and vice versa. There’s a correct way and an incorrect way.

The old formula

Most people still assume that 1 dog year is equal to 7 dog years. This belief was probably first introduced in the 1950s. However, it’s not the correct way to measure it.

Although there’s been plenty of research since then disproving the 7:1 ratio, people continue to believe it. This formula might be based on an idea that dogs live to 10 or so years, and humans live reach 70 years old, but honestly we don’t know when it first started.

The 7 to 1 rule is simple to calculate and remember, it’s unfortunately incorrect.

The correct formula

The best method of converting human years to dog years is more complex.

The American Veterinary Medical Association has the following to add to it:

  • The beginning year of a medium-sized dog’s lifespan equals around 15 human years.
  • The second year of a dog’s life equals about 9 human years.
  • From then on each year of a human equals four or five dog years.

Keep in mind that smaller dogs tend to live longer than bigger dogs. Scientists concluded that every 4.4 pounds of body mass reduced a dog’s life expectancy by about a month.


Becky Roberts

Becky Roberts

One of Becky's favourite things to do every morning is to browse the top pet-related forums, looking for issues and questions that people have. She then shortlists the most common ones, and turns them into blog posts for Fuzzy Rescue. She's had over 4 cats and 2 dogs over the past decade, so she does know a thing or 2 about raising/training, and more importantly, loving them. She's the only one on our team that doesn't like coffee, but it seems to us she really doesn't need more energy :). We're very fortunate to have her on board as she does most of the heavy listing for the site, outputting an insane amount of content each month. Read More

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