Everyone is right, you can't blame yourself. We all seem to rely on the fact that if it's made as a cat toy or product, it will be safe. Both my cats wear break free collars with bells, mostly so I don't step on them in the dark as the never go outside. One night I was at my computer when Tilly came running into my room. She sat down by my feet and froze. I started talking to her, asking what was wrong, but she didn't move. Then she did the dinosaur stance (up on the back feet) and attacked my foot! I looked down and saw that her collar, which I had on too loose, had gotten stuck on her bottom teeth, and I guess she wasn't strong enough to break it free. So I picked her up and tried to break it free. It must have hurt because she was moaning, but she was sure happy when it came off! I felt terrible.. after that I tightened her collar a little bit. She is used to wearing it now, but I am so glad that she knows to come and get my attention any way possible for help!