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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.
Asker's rating. 1  It depends completely upon the breed. On average, little dogs live longer than big dogs. 2  Depends on the breed. A general rule of thumb is that bigger dogs have shorter lifespans. 3  Small dogs often live to 14 or 15 years of age, medium to large dogs live to 10-13 years and large bulky dogs live to 6-11years. Source(s): http://www.yourpurebredpuppy.com/health/articles/dog-lifespan.html