A pinch of white hair on a dog's head can be raised. Dogs are carnivorous canines, mammals, and dogs have white hair on their heads, which is just a normal color and will not have any influence on dogs. Dogs are domesticated by wolves. As early as the era of hunting and gathering, people have domesticated dogs as hunting assistants. So dogs are the earliest domesticated domestic animals. Dog bones have been found in Cishan, Wu 'an, Hebei, Peiligang, Xinzheng, Henan and Hemudu, Yuyao, Zhejiang, which proves that it has a long history of domestication. The dog-shaped scorpion unearthed in Sanlihe, Jiaoxian County, Shandong Province, is vivid and lifelike, showing the morphological characteristics of domestic dogs in the Neolithic Age. The dog bones unearthed from Anbanpo site in Xi 'an, Shaanxi, have smaller skulls, protruding frontal bones, smaller teeth and curved horizontal edge of mandible, which is quite different from that of North China wolves, indicating that the history of human domestication of dogs is indeed very early.