It is an old wives tale that one dog year is equal to seven human years.The ratios for small dogs are more like 12:1, for medium-sized dogs, 10:1, and for large dogs, 9:1, but even that is only roughly accurate for the first two years of a dog’s life. As you may have guessed, comparing dog years to human years is inexact at best. Dog years are not so simple to calculate, because many factors determine a dog's true age. Among the variables are breed, activity level, size, and general health and stress. From all the information on the subject that I have studied and absorbed, it is also clear that dogs do not age at a fixed rate. Dog years tend to accumulate faster early in a dog's life, with the rate of aging slowing down and normalizing once the dog reaches adulthood.
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