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7 to 1 - Not True

Dog years and human years. A good way to view your dog's age is by comparing it to your own. That way you'll be able to recognize why your companion may be slowing down, acting strange, or in need of a different diet and/or exercise plan. For years, we have used the old standard that 7 dog years equals 1 human year.

That's changed.

Based on information developed by Dr. Fred. L. Metzger, D.V.M., Dipl ABVP, State College, Pennsylvania, the size of your dog will determine the "dog to human year ratio."

If your dog is 20 pounds or less it will be 36 human years old when it reaches the age of 5 years. From then it will age about four human years to every one dog year. He will become a senior at age 7 (44 human), and a geriatric at age 14 (72 human years).

A dog between 21 and 50 pounds will be 37 human year old when it reaches the age of 5. It will age between 4 to 5 human years for each dog year after reaching 37. It becomes a senior at dog age 7 (47 human) and a geriatric at dog age 12 (human 69).

From 51 to 90 pounds a dog will be 40 human years old when it reaches its 5th birthday. From then it will age 5-6 human years for each dog year. At dog age 6 (45 human) it will be a senior, and a geriatric at dog age 10 (66 human years).

The larger dogs, over 90 pounds, age the fastest. By dog age 5 (42 human) they are considered to be seniors, and by dog age 10 (78 human) they are geriatrics. The human age to dog age ratio runs pretty close to the old 7 to 1 standard.

Use this guide to determine your dog's changing health needs. Consult with your Vet about changes to it's diet and exercise requirements. Early reaction to your dog's changing needs will go a long way in helping your dog live a longer and healthier life.

For a breed longevity chart visit When is a Dog Considered Senior?

Written by Ron Lueth, Pet Guardian Angels of America

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