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狗是一种平常的犬齿动物，是狼的近亲。它寿命差不多xx年—最多30年。
dogsusuallyreferstothedogs,alsoknownasdogs,amoncaninemammals,isacloserelativeofthewolf.oftenreferredtoashumanbestfriendisalsothehighestrateofkeepingpets.hislifewasaboutten-morethanthreedecades,intheabsenceofanaident,theaveragelifespanofsmalldogstobelonger.