I have indoor only kitties and none of them are collared. Mostly becuse they're all still kittens and I could never find a collar small enough for them not to get out of...then I worry about choking, Scout's big enough to wear one now and since he's the ony one with an outdoor fascination he most probably will get a collar and tags. Actually he has a Harley Davidson collar and his rabies tag...I'm just waiting to go to Petsmart to make one of those tags with his name any my phone number. I just know he's going to hate it.