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en.wikipedia.org/wiki/Aging_in_dogs

Aging in dogs (Canis lupus familiaris) varies from breed to breed, and affects the dog's health, ... By this terminology, the age of a 6-year-old dog is described as 6 dog years or 40–50 human years, a reversal from the previous definition. .... is no one authoritative chart; this chart follows best information presently available.

pets.webmd.com/dogs/how-to-calculate-your-dogs-age

If you own a dog, you've heard this rule: 1 year for Fido equals 7 years for you. Turns out, the math isn't that simple. Dogs mature more quickly than we do early ...

www.pedigree.com/dog-care/dog-age-calculator

Use our dog age calculator to see the conversion from dog years to human years. PEDIGREE® can help you determine your best friend's age.

www.akc.org/content/entertainment/articles/how-to-calculate-dog-years-to-human-years

Nov 16, 2015 ... Since the 1950s, the popular calculation of how old a dog was “in human years” has been that 1 dog year is the equivalent of 7 human ones.

www.ajdesigner.com/fl_dog_age/dog_age.php

Use this by breed dog age calculator. Easily convert your dog's age to human years. Visit to learn if your dog is old or young.

www.petcarerx.com/article/lifespan-of-a-dog-a-dog-years-chart-by-breed/1223

Are you wondering what the usual life expectancy of your dog is? Lifespan for dogs varies from breed to breed. Find out what the average lifespan of your dog ...

www.dogyearschart.com

Find your dog's human age in years with this free calculator.

www.almanac.com/content/dog-age-chart-dog-years-human-years

See how old your dog is with our dog age chart, which converts dog years to human years.

www.onlineconversion.com/dogyears.htm

Note: It is a common belief that 1 human year is equal to 7 dog years. That is not very accurate, since dogs reach adulthood within the first couple of years.