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Anonymous
For the same reason that humans can easily live 80 years. Every species has an average "aging speed" which is optimized to fit the environment where it's from. For dogs (and wolves) it just happens to be faster than cats. Larger dog breeds have shorter lifespans, partially because larger size also translates to more stress, but I've never heard of a dog of any breed reaching an age comparable to the oldest cats (well over 30, oldest almost 40).
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