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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, physical ability and life expectancy. Older dogs, like this 10-year-old Neapolitan Mastiff, often grow grey hairs on their muzzles; some dogs grow grey hair all over. As with humans, advanced years often bring changes in a dog's ...

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. Even though this formula has been around for a surprisingly long time, the reality is not so cut-and- dried. That doesn't stop many people from defaulting to this ...

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.

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

Jul 23, 2017 ... By 10-15 years: Teeth are worn, and heavy tartar buildup is likely. Some teeth may be missing. Your vet can also guess her age based on a complete physical exam or tests that look at bones, joints, muscles, and internal organs. Senior dogs might show some specific signs of aging. Cloudy eyes; Gray hair.

flexpet.com/how-to-calculate-dog-years

How to calculate a dog years in human years. No one formula is fully agreed upon, here is the modern method.

www.proplan.com/dogs/dog-age-calculator

How old is my dog? Translating dog years to human years can be a challenge. Purina Pro Plan's Dog Age calculator factors in age & breed size to be as accurate as possible.

www.cesarsway.com/dog-care/lifecycle/dog-years

How to calculate a dog's age. ... Ask most people how to determine a dog's age in human years, and they'll probably say, “Multiply by seven.” However ... Dogs mature faster than humans, reaching the equivalent of twenty-one years in only two, but then aging slows to an average of four human years every year after. Dogs ...

www.slate.com/articles/news_and_politics/explainer/2009/05/a_dogs_life.html

May 7, 2009 ... The oldest dog in the world, a dachshund from Long Island named Chanel, turned 21 on Wednesday. Some news reports listed her age as 120 in "dog 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. The formula used above is from a canine expert and is a bit more accurate. (as accurate as one can judge these things). The formula is: 10.5 dog years per human year ...