3 of my 4 cats are strictly indoors. Panda Bear (my semi-feral cat) is becoming more and more indoors, especially now its getting cold - she spent all last winter outdoors so I'm sure she's happy as a lark being inside now. She doesn't bolt for the door near as often as she did. She's turned into such a loveable doll so she enjoys all the loves she gets from me. The other 3 have never been outdoors and seem really afraid of the outside.