How do you know if your cat wants to be an outside cat? I want it to be an indoor only as I've had 3 now that I let outside and they have disappeared. My kitty always is sitting in a window and seems to be very curious about the outside. I'm afraid I'm being cruel by not letting her experience the outdoors and I don't want her to become unhappy. She doesn't know it, but being an indoor cat is for her own safety.