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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.
Overview. Some dogs will live much longer and age much more slowly than others. Consequently, one might say for one dog that for each calendar year it ages the equivalent of 10 human years whereas another dog ages only 5 human years. The key factors that determine how long a dog will live are: 1  Size of dog. 2  Generally, small dogs live much longer than large dogs.