MYTH BUSTED! One Human Year Is Not Equal To Seven Dog Years

Myth: One dog year equals about seven human years.


It is a popular belief that dogs age seven years for each  calendar year according to the calculation of a dog’s lifespan.  Dogs live on the average of about one seventh in duration to a human’s average lifespan. This means that a three year old dog is equivalent to a twenty-one year old young adult in terms of this aging processes.



Determining the exact age of dogs is much more complicated than multiplying their lifespan by seven.


Dogs age much faster during their first two years relative to the first fourteen years of a human’s life.   It turns that the first year for most breeds is equal to about 14-15 human years.  However, depending on the dog`s size in pounds typical for its breed, the same number of actual years corresponds to different number of human years, with this scale varying greatly from breed to breed.


Small dogs (20 pounds or less) are considered senior dogs when they reach ten years and above.


While large dogs (51-90 pounds) mature more slowly but at the age of five they will be considered a senior dog. while small and toy breeds are not considered seniors until the age of ten.


In general, after the first two years of small and medium–sized dogs, the ratio is about 5 dog years to 1 calendar year.  Large and Giant breeds have 6-7 dog years to 1 calendar year for large and giant breeds.


For example, a 10-year-old Retriever would be considered 80 years old on the human age scale while a 10-year-old Dachshund would only be 64.


Here are more facts about dog age!

There is a somewhat simplified generic formula used by many canine experts for determining dog age: 10.5 dog years per human year for the first 2 years, then 4 dog years per human year for each year after.


How do you know a dog’s age when his birth date is unknown?  First of all, a dog’s age is apparent from the degree of growth and the condition of their teeth. The vet will estimate the dog’s age based on a physical exam of bones, joints, muscles and internal organs.


Mixed breeds tend to live longer due to greater genetic diversity while some pure breeds are prone to diseases!


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