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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.
Terriers can often live until 16 years of age for example, whereas a good lifespan for some larger breeds can be as short as 10. An average dog lives for 10-11-12-9-8 years   Another answer:Assuming they are healthy overall, large dogs live an average of about 10 years, small dogs, about 15.erriers can often live until 16 years of age for example, whereas a good lifespan for some larger breeds can be as short as 10. An average dog lives for 10-11-12-9-8 years   Another answer:Assuming they are healthy overall, large dogs live an average of about 10 years, small dogs, about 15.