Difference Between Dog Years and Human Years

Dogs age more quickly than humans. A dog’s and a human’s lifespan can be affected by a variety of variables. A dog’s life is influenced by factors such as breed, size, gender, diet, living conditions, and individual characteristics.

Humans, on the other hand, are affected by elements such as health, living situations, the environment, and diet.

Dog Years vs Human Years

The main difference between dog years and human years is that a dog year is identical to 15 human years, whereas 15 human years are equitable to a dog’s initial years. Furthermore, unlike humans, dogs are expected to live for 10-16 years, whereas people are expected to live for at least 72 years.

Dog Years vs Human Years

A length of time in a dog’s life is defined so that a dog’s average life expectancy in “dog years” is numerically similar to a human’s average life expectancy.

A 4 and 5-year-old dog are roughly the same age as a 28- to 30-year-old human and a 33- to 35-year-old human, respectively. The most typical formula employs a seven-dog-year-to-one-human-year ratio.

A human year is the orbital period of a planetary body traveling in its orbit around the Sun, such as the Earth.

Because of the Earth’s axial tilt, the seasons shift throughout the year, resulting in weather changes, daylight hours, and, as a result, vegetation and soil fertility.

A unit of age-related to the species under consideration, defined as the age of a human being in calendar years multiplied by an animal’s age in “human years.”

Comparison Table Between Dog Years and Human Years

Parameters of ComparisonDog YearsHuman Years
1st YearThe first dog year is equal to 15 human years15 human years are equivalent to the first year of a dog’s life
Subsequent year calculationThe subsequent year is equal to nine human years. Every additional year thereafter is equal to about four or five human years.1 year is equal to 5 years
Average Life Expectancy10-16 years72 years
Main Determinants of LifeBreed and sizeGenetics, health, and sex
Age GroupsPuppy (6 to 12 months), Adulthood (12 months to 3 years, Senior (6 to 10 years)  Child (0-12 years), Adolescent (13-18 years), Adult (19-59 years), and Elderly  (60+ years) 

What are Dog Years?

Dividing one dog year by seven human years has been the conventional method for estimating how old a dog was “in human years” since the 1950s.

The truth is not so easy, even though this strategy has been around for an abnormally long time.

Many people continue to use the traditional way despite this. The 7:1 ratio appears to be predicated on the assumption that humans live to be around 70 years old and canines live to be around 10 years old.

This indicates that the idea that a dog year is equal to seven human years is untrue and unfounded. Small dogs are known to be ‘senior’ at seven years of age, but we all know they still have a lot of life remaining in them.

Larger-breed dogs live shorter lives than smaller breeds, and when they reach the age of 5 to 6 years, they are often considered senior. 

A medium-sized dog’s first year of life is approximately 15 years for a human, the second year of a dog’s life is approximately nine years for a person, and the third year of a dog’s life is around four or five years for a human.

In other words, as a dog matures, the number of human years increases at a faster rate.

What are Human Years?

A human year that commences on January 1st and concludes on December 31st is known as a human year. In general, all of the holidays are centered on the calendar year.

A Human Year is the name of the yearbook that we use in general. A human year is made up of 365 or 366 days (When it is a leap year).

And we are obligated to follow the calendar year, which runs from January 1 to December 31, and we cannot modify it because it is followed by everyone around the world.

We can’t choose the human year on our own because it’s a globally accepted concept.

It has been discovered that using a calendar year simplifies tax reporting. The human year is also used to account for holidays, birthdays, anniversaries, and death anniversaries.

It not only aids in such activities, but it also has other advantages such as being simple to follow, broad use, and so on. The revenue and expenses are segregated and then calculated over the course of a calendar year.

The human year is also useful for calculating or comparing the financial statements of two companies.

This is because, even if they may have different fiscal years, the disparities are easy to see and understand throughout a calendar year. A normal calendar year, as opposed to a dog year or any other animal species’ “year.”

A unit of age-related to the species under consideration, defined as the age of a human being in calendar years multiplied by an animal’s age in “human years.”

A unit of age-related to the species under consideration, defined as the age of a human being in calendar years multiplied by an animal’s age in “human years.”

Main Differences Between Dog Years and Human Years 

  1. The very first year of a dog’s life is supposed to be equal to 15 human years and 15 human years are the equivalent to a medium-sized dog’s first year.
  2. A dog’s second year is about 9 nine years whereas on average each human year is approximately 5 dog years
  3. The average life expectancy of a dog is 10 to 16 years which is equivalent to 64 to 94 human years whereas the average life expectancy of a human is 72 years which is equivalent to 9-10 dog years.
  4. The main determinants of life for a dog are breed and size and for a human, its genetics, health, and sex.
  5. Dog years are divided into puppyhood, adulthood, and senior years. On the other hand, human years are divided into childhood, adolescence, adulthood, and senior years.


A dog can live to be nine years old, while a man can live to be eighty. Large dogs age quickly, and their lives seem to move at a breakneck pace.

According to researchers, every 4.4 pounds of body mass decreased a dog’s life expectancy by nearly a month. The cause of this is unknown.

Smaller breeds of dogs have a longer lifespan and are considered to be ‘senior dogs’ at the mere age of 7. Humans are considered to be ‘seniors’ after the age of 60.


  1. https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1004093
  2. https://www.science.org/doi/abs/10.1126/science.1197175
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