When Your Dog is 12 Years OldThe old adage of "one year of a human's life is equal to seven years in a dog's life" is all wrong. Dogs mature more quickly than humans, so a simple one-to- seven calculation just isn't accurate.
Joan Merriam: The older dog Many of us who've passed the half-century mark aren't crazy about getting older...yet it's a fact of life we can't dismiss with a wave of a magic wand. We feel the same way about our dogs: we recognize that sweet "sugar face," the slightly grizzled, gray muzzle that signals our beloved dog is no longer a puppy...but we'd rather not admit that reality.
Calculate Your Dog's Age With This New, Improved Formula smithsonian.com One dog year is not equivalent to seven human years, despite widespread use of the ratio for calculating the age of canine companions. Presumably, the ratio is based on the average lifespan of dogs being 10 years and humans being 70 years, it's not quite so simple.
Caring for a Senior Pet A dog's muzzle often turns gray as it ages, but in cats it is difficult to distinguish an older animal. Even so, as a pet ages, its needs change - as your furry friend's owner it's up to you to make sure your companion gets the best possible care to enjoy its senior years.