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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.
In addition to the other answers (smaller dogs live longer) you can sort of approximate by using the dog years translation of 1 dog year = 7 human years. So if humans live to be 70 or 80, maybe an average dog lives to be 10 or 11, and some can live longer.