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.。555影院（513518.com）为您提供狗的故事影片提供最有价值的影音报告!如果喜欢这部电影《狗的故事》，分享链接 http://513518.com/shipin/goudegushi.html