All my cats were wearing collars even though they are indoor cats. We were travelling so much, I didn't want to take any risks. Well, except for Ebony. She couldn't stand it and would shake her head and scratch every 20 seconds. The sound of her bell drove me nuts. So I would only put hers on for the travel day.

The collars are all color coded, and the ID tags are different, reflects their personality.

After 6 months, I noticed that Ruffles has a bare spot all around her neck from the collar. It was LOOSE, but all the fur stopped growing. I felt sorry for her. As we stopped travelling, I took all the collars off. We do take them out in the back yard with us at times, but now we have fenced that in, so less risk there as well. The collars go back on for travel, even to the vet.