For as long as humans have been keeping pets, cats and dogs have been the two most popular choices. And while there are many similarities between the two, there are also some key differences - one of which is life expectancy. Cats tend to outlive dogs by a wide margin, with the average cat living to be around 12-15 years old, while the average dog only lives to be around 7-10 years old. So what's the reason for this discrepancy?
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