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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.
Best Answer: They usually live for about 12-15 years. They can live up to 20, but that is extremely rare. I have a sheltie and she is about ten and she sounds like the spitting image of your dog in activity. It isn't unusual for them to start slowing down at that age.