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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.
Dog life expectancy. A giant-breed dog is a senior pet at six years of age, but a medium-sized dog is a senior at eight years of age. The average dog lives 10-12 years. Dogs that have good nutrition, daily care at home, and veterinary care, live the longest.