Dog Age Calculation

The calculation of a dog's age varies from human age. To get a rough estimate of a dog's age in human years, multiply the first two years of a dog's life by ten years, then add the remaining years by five. For example, a dog that is two years old is equivalent to a 20-year-old human, and a dog that is four years old is equivalent to a 32-year-old human. However, the breed and size of a dog also play a role in their aging process, as smaller dogs tend to have a longer lifespan than larger dogs.