How old is a 10 year old dog?

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During the first two years, one dog year equals about 10.5 human years. So, the dog: human aging ratios is 10.5:1 rather than 7:1. When a dog hits the three-year mark, he ages 4 years to every 1 human year bringing the ratio to 4:1. Using this formula, a 10-year old dog is the equivalent of a 53-year old human.