The protection period of rabies vaccine is within half a year, that is, according to China’s rabies prevention and control guidelines, from the last shot of rabies vaccine, within half a year again by the cat, dog scratching and biting to produce rabies exposure can be without rabies vaccine. More than half a year, less than a year of cases can be given two booster shots to prevent. More than one year, less than three years can be given three booster shots to enhance antibody prevention. If you have been exposed to rabies from a cat or dog bite for more than three years, you will need to be revaccinated with a full course of rabies vaccine.