Seven days after birth, the puppy is too weak to nurse?

There are several main reasons why puppies born three days ago don't breastfeed: First, dogs don't breastfeed because of congenital brain hypoplasia and can't suck. Second, puppies suffer from other diseases, so they don't eat milk. Because newborn puppies have very weak resistance, if they are infected by bacteria, they are likely to have a high fever, no food and die.

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 shape unearthed from Sanlihe River in Jiaoxian County, Shandong Province is lifelike, which makes us see the morphological characteristics of domestic dogs in 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.