Why do dogs have a shorter lifespan compared to humans?

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EACH dog’s expected lifespan may differ from one to another. A small dog is expected to live 10 to 15 years, a medium-sized dog to live 10 to 13 years and a large dog to live between 8 to 12 years. Dogs have the tendency to age faster compared to humans, with an average lifespan of 10 to 18 years. The factors affecting their lifespan include