Oh trust me. . fleas find your cat wether they go outside or not. They hitch a ride in on you or through Windows or on other pets that in outside. . then they lay eggs like crazy that fall off in your house and lay dormant for a while so just when you think they are gone NOPE here they are again. It's a constant battle.My kids want a cat. Its one of the few pets I've never had. Question, how do they get fleas if they don't go outside???