Booster doses of rabies vaccine are given if a previously vaccinated animal is exposed to rabies virus to protect them. However, there are no recommended PEP regimens for unvaccinated animals. Unvaccinated animals that are exposed to the rabies will usually be euthanized, or more rarely, put into extended quarantine (isolation) during which time they are vaccinated. Animals with expired rabies vaccinations will usually be put into quarantine for observation and revaccination. This underlines the importance of maintaining current rabies vaccination in pets.