Whether rabies serum is necessary depends on the degree of injury and the location of the bite. 1. Degree of injury: it can be divided into first-degree exposure, second-degree exposure and third-degree exposure. First-degree exposure refers to being contacted or licked by a dog or an animal suspected of having rabies, the risk of which is relatively low and rabies serum is generally not necessary, while third-degree exposure refers to being scratched or bitten by an animal suspected of having rabies and having been bitten in the head and face, in which case rabies serum is necessary. 2. Bite parts: if only the limbs are contacted by dogs or animals suspected of rabies, or there is a slight breakage, generally do not need to play rabies serum, only need to be injected with rabies vaccine, but if the head, face, neck and other vascular parts of the body were bitten, or more parts of the body were bitten, then you need to play rabies serum. After being bitten by a mammal, you need to rinse the area locally with soapy water at the first opportunity to prevent infection with the rabies virus. Seek medical attention if you feel unwell.