The reason why domestic red meat can't be eaten as raw flesh and blood is that red meat is listed as a carcinogen by the World Health Organization. Raw flesh and blood generally refers to the raw food feeding of dogs, that is, feeding raw meat and bones to dogs. Although red meat is rich in nutrients such as protein, iron and zinc, some ingredients in red meat may have negative effects on the health of dogs. For example, some protein may cause allergic reactions in dogs, while some fatty acids may be harmful to the cardiovascular system of dogs. Therefore, it is not recommended to use domestic red meat as raw meat for dogs.