How Long is a Dog Year?

How long is a dog year? 

It is generally thought that a dog year is equivalent to seven human years. So, if your dog is one calendar year old, people say that it is seven years old in dog years. 

However, different breeds of dogs have different life expectancies or life spans. 

In dog terms, it’s “live big, die young” – meaning that larger breeds of dogs die sooner than smaller breeds of dogs.  

Small dogs live on average for about 15 calendar years. 

Large dogs live on average for about 10 calendar years.

Many factors affect the average lifestyle of humans. In 2017, the data.worldbank.org scientists calculated that humans (the average from all countries around the world) live for about 72.2 years. 

Therefore, if we calculate a dog year based upon the average lifespan of a human, the results would be:  

For small dogs, a dog year is equivalent to about 4 years and 10 months (let’s say five human years).

For large dogs, a dog year is equivalent to 7 years and 2 months (let’s say 7 human years). 

Therefore, on average, a dog year is equivalent to six human years.  

Photographer: Martina Nicolls

Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM

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