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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.
Many people believe that one year of a dog's life is equal to seven human years. A 22 year old dog would be 154 years old. This is not realistic and has been proven to be false. For example, dogs are capable of reproducing at around one year of age, but a seven year old child is far from sexually mature.