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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.
If it helps, you can also think of it this way: a dog's lifespan is a lot shorter than yours (maybe 15 years compared to 75 or more for you), so that means a dog ages much more quickly in the same amount of time. How old a dog will live depends upon many factors, including its particular breed and size as an adult. Small dogs often live 15 years or more. Medium and large dogs tend to live shorter lives (10-13 years). Giant dog breeds, like mastiffs, might only live 7-8 years.