That happened to Brooke's little Mocha last spring! I couldn't even imagine coming home to find that.
I buy the little breakaway collars made for cats. They have a little bell on them, so I can always hear where Dublin is, but they will pop off if they get pulled. Every couple of weeks it gets lost, so I keep spares...
I don't keep one on Widget. One, Dublin yanks them off of her, and two, she's so small and dainty that the bell doesn't jingle when she walks..