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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.
Pets age much faster than we do. The life span of a dog depends on its size or breed. In general, the larger the breed or size of the dog, the shorter the life span. For example, in a study of lifespans, only 13% of giant breed dogs lived to be over 10 years old. Conversely, 38% of small breed dogs live to be over 10 years of age. Dogs are considered senior in the last 25% of their lives. Below is a list of the most common breeds with their life expectancies and age at which they are considered senior.