In states where rabies vaccination for cats is mandated by law, the rabies vaccine is required for all cats, regardless of whether they are outdoor cats or indoor cats. The rabies vaccine might also be recommended by your veterinarian even in states where rabies vaccination for cats is not required by law. Your veterinarian will determine your cat’s level of risk and tell you if the rabies vaccine is a good idea. Outdoor cats, or cats that go outdoors occasionally, are more likely to encounter rabid bats and other wildlife that can transmit rabies.