Dog Years Vs Human Years

People commonly think that each year of a dog's life is equal to 7 human years. If this were true, it would mean that a 1-year-old dog, who is able to reproduce, is the equivalent of a 7 year old child. It would also mean that a 15-year-old dog, which is not an unusual age for a dog, is the equivalent of a 105-year-old person, which is an unusual age for a person.

A more accurate comparison between human and dog years has been devised. A 3-month-old puppy is 5 years old in human years (equivalent to a young child). A 1-year-old dog is a teenager of 15, and a 2-year-old is 24. After that, aging slows and 4 human years are added for every dog year. At 3 a dog is 38, at 5 he is 36, at 10 he is 56, and at 15 he is 76. Sources differ on the exact age equivalents in the later years, but a dog who reaches 20 is to be 91 to 96 in human years.