After being bitten by a dog, bleeding level three belongs to the serious exposure, generally contact with cats and dogs or after being bitten exposure is divided into three levels: level one exposure is contact with cats and dogs, but not bitten; level two exposure is bitten or scratched by a dog, but there is no skin bleeding, only a kind of epidermal damage; level three exposure is bitten or scratched by a dog, damage to the subcutaneous layer and the dermis, there is Bleeding phenomenon or serious contamination of mucous membranes, some can see the dog’s saliva on the mucous membrane contamination and other circumstances. The first level of exposure does not require rabies vaccination, while the second and third levels of exposure must be injected with rabies vaccine after being bitten by a dog, and the rabies vaccine should be injected after five shots to form a full immunity in order to effectively prevent the spread of rabies.