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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.
Life Expectancy. Usually small dogs will outlive larger dogs. A general way to calculate the comparison of age to humans is to multiply a larger dog's age by 8. For small dogs, multiply by 6. If your shih tzu is 15 years old, she is equivalent to an adult who is 90.