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Since the 1930s, the canine life span has increased more than 70 percent, from seven years to 12! And that's just the average. With advances in veterinary care and nutrition and more knowledgeable owners, many good-sized dogs now live to 14. Of course, no one can really predict how long an individual dog will live.
The aging profile of dogs varies according to their adult size (often determined by their breed): smaller dogs often live over 15â16 years, medium and large size dogs typically 10 to 13 years, and some giant dog breeds such as mastiffs, often only 7 to 8 years. Under this system, a 6-year-old dog would be described as having an age of 6 human years or 40â50 (depending on the breed) dog years. 2  The other common system defines dog years to be the actual calendar years (365 days each) of a dog's life, and human years to be the equivalent age of a human being.