My daughter in law put those break away collars on Amy and Giz but Giz is one to get into everything and one day she got hers caught on the blinds at the window and she paniced and fell.. the collor did not break away and Giz was left hanging there choking.. Collars have been removed on both. But I have seen cats wear them all their lives and never have a problem.. I would think one bad experience is enough and I would not risk it myself.