人类的第一个朋友 Man’s First Friend(4KHDR电影下载)-2018年-8.1豆瓣评分-(夸克资源)人类最好的朋友狗

He has shared our lives for 20,000 years. Along the way, he has helped us find food, kept our livestock, protected us from our enemies, guided us in extreme conditions, and saved us from peril. Now, he comforts us, relieving loneliness and helping us cope with old age. How did dogs come about?