The Humane Association operates the largest adoption facility in Butler County, Ohio. A popular myth claims one year of a dog's life equals seven human years. At the age of twelve months a dog is about fifteen human years old. Larger breeds, especially giant breeds, mature slower and live shorter lives.
Small breeds tend to mature more quickly and live longer.
Below is a guideline for figuring how old the average dog is in human years. After two years of age, the scale goes up a ratio of 4 dog years for every human year. Remember to have your pet vaccinated and examined by a Veterinarian every year to be sure it is healthy.