It has always been commonly believed that each year of a dog’s life is equivalent to seven in human years. However, this isn’t exactly accurate, since a one-year-old dog can give birth, whereas a seven-year-old child cannot. And how would you explain the world’s oldest living dog on record making it to 29? (That would be 203 in human years!) Then, of course, there’s your 11-year-old dog that sure seems frisky for 77. That is why veterinarians have determined that 77 is the “new 60” and have come up with a more accurate way to calculate a dog’s age in human years. The following steps will show you how.

1. If a dog is one-year-old it is age equivalent to a 15-year-old human (not 7 as we always thought).

2. When a dog reaches the age of 2 he is already approximately 24 in human years, rather than 14 as commonly believed. But not to worry; read on.

3. Add 4 years to every year after the age of 2. For example, a 3-year old dog is equivalent to 28 in human years; a 4-year-old is 32; a 5-year-old 36; a 6-year-old 40, and so on.

4. Take the dog’s size into consideration. Smaller dogs typically have longer life spans than larger dogs, with toy breeds tending to live the longest and giant breeds the shortest. For example, using the above method, a 6-year-old dog is considered to be 40 in human years, when in fact a larger dog may actually be closer to 42. However, veterinarians consider this to be a good general chart to follow for all dogs.