Dear Lori, even if your cat is an indoor one it is recommended to go through all the preventive treatments, like flea prevention, deworming and immunizations. Each veterinary clinic has its own protocol of preventive care. The basic lines for an adult cat are:Dewormings every three month with a broad spectrum product Flea and tick prevention should be used, in my opinion, on strictly indoor cats at the longest time interval indicated by the manufacturer. For example in the case of Frontline Plus it is usually used monthly on outdoor cats but in my opinion it can be used at 8 week intervals as its insecticidal efficacy against new infestations with adult fleas persists for 8 weeks. Immunizations should be started immediately and followed throughout the cat’s life. The Feline Leukemia immunizations was usually recommended only for outdoor cats and a risk assessment should be done by your vet. Even if the vaccine is considered to be a non-core one it is highly recommended by the American Veterinary Medical Association. After the first three to five years of continuous immunizations the time interval between them can be prolonged. This depends on the type of vaccine and the brand your vet will use, so it is highly recommended to discuss this problem with her/him.I am hoping that this information was useful. If you require any other information please let us know.