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.。狗的故事在线免费观看如果您喜欢达达兔影院（ddport.com）分享的《狗的故事》，别忘了推荐给你的好友！