The length of time a rabies vaccine lasts in the body is generally between six months and one year, with some individual variation. The rabies vaccine must maintain a certain antibody titer in the body in order to have a protective effect on the body. If the antibody titer is insufficient, the body loses its protective effect and further rabies vaccination is required. The protection period of the rabies vaccine is usually between 6 and 12 months, after which the effect of the antibodies will become weaker. After the rabies vaccination, if the patient is bitten by a dog again after six months, it is recommended to receive rabies vaccination in time to avoid the rabies vaccine losing its protective effect and causing rabies attack. At present, rabies is still an incurable disease, so patients need to actively preventive treatment.