I copied this from a 11/02 post:

"Freckles, strictly an indoor cat, doesn't wear a collar, but is chipped.

About 1970, my cat Jerry, was licking and cleaning his chest. Suddenly a lower canine tooth caught in the buckle of his leather collar. Fortunately, he was sitting right in front of me when it happened. I had to cut the collar off. None of my cats ever wore a similar collar again."

I know this is very scary.