(Chuckles) You can't. Cats are too smart and too curious. They'll find a way to climb the tree, no matter what you do. You can try to keep them away from the tree with toys and treats, but ultimately, they'll find a way to get to the tree. Just make sure the ornaments are all unbreakable and that the tree is stable enough to withstand a cat's climbing. (Smiles) And don't forget to have a good sense of humor when your cat inevitably knocks the tree over!