I stopped putting collars on my cats because of Zasper death. She had a safety collar and everything, but it didn't seem to help. I came home one day and she had passed away because she choked on her collar, it somehow got stuck in her jaw. It was one of the scariest and most tramatic things I'd ever experienced. So since then I don't think I will ever put a collar on any of my cats. As soon as I get a little extra money I'm going to get Corkscrew and Tibby microchipped. Here's a picture of my Zasper, she's very missed but I know she's happy at the rainbow bridge.