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.。chinaseedbed.com让您随时随地都能在线观看，无需下载或等待，即刻畅享好看的电影。想看更多的相关作品欢迎您光临chinaseedbed.com（花卉影视）网站！