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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.
Most dogs in this size range live 10-13 years. But in some medium to large breeds, serious health problems are so common that it can be difficult to find an individual that you can count on remaining healthy for a normal lifetime. Many dogs in these particular breeds are lucky to make it to 6 or 7 years old.