How Old is 3 months in Dog Years?

Last Updated on September 20, 2023

3 months in dog years roughly equals 2 years 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)

Calculating how many human years is 3 months 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 calculation

The majority of people still believe that one dog year is equal to 7 dog years; this assumption was probably first introduced in the 1950s, but this isn’t the best way to measure it.

While there has been quite a bit of research since then that disproves the 7:1 ratio, it seems people are still holding on the idea. This formula may be based on the belief that dogs live for about 10 years old and humans up reach 70 years old, but honestly we don’t know when it started.

Therefore, while the 7 to 1 rule is easy to calculate and remember, it’s unfortunately incorrect.

The correct way

The best method of converting human years into dog years is more complicated.

The American Veterinary Medical Association has the following to be said about it:

  • The first year of a dog’s life is about 15 years for humans.
  • The second year of a dog’s existence is roughly 9 years for humans.
  • From that point forward, every human year equals either four or five dogs 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.


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