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Dogs have long been dependable companions by our sides. But it wasn’t always that way, and a look at their closest living relative, the wolf, makes it clear why. Research into dog domestication and intelligence offers clues into the human-dog relationship. And analyzing dogs’ brain activity and genes may even help answer whether dogs are in it for the food—or if they really love us.纪录片狗的故事2020影音先锋在线观看_狗的故事2020全集在线观看_电影狗的故事2020高清完整版在线观看.