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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 experts agree that small breeds tend to outlive large breeds. The general rule of thumb is the larger the dog the shorter the life span. Large medium to large breed dog tend to live about ten years, although there are exceptions to every rule. We have a feisty-willed large breed mutt who is determined to see his fifteenth birthday. Smaller breeds tend to live longer, anywhere from twelve to fifteen years.