Fortunately - we can still have a tree - even with cats. When I had my Meezers years ago I stopped using tinsel since that got slurped up like spaghetti, but fortunately "passed thru" with no problem, and I've never used it since. Now that it's only my son's 2 cats and they really take no interest in anything unless it's shiny and breakable, the unbreakable decorations get put toward the bottom, so if they do manage to knock any off, then no harm done. Who said you can't outsmart a cat???