We used to have a cat that loved bells; she'd ring them at every opportunity. Guess what we hung on our Christmas tree? You guessed it—bells, some high and some low. The littlest of our two cats decided that she needed to ring the highest bell; she had to climb that tree to reach it. The tree of course was not quite up to the chore of supporting a rambunctious cat, so it toppled. She never climbed a Christmas tree again she was so surprised.
We stabilized the tree by tying it to the banister for as long as she was with us. We used a high-test fishing line, and it worked very well.
Ann O'Brien Cooney