That's a great question! Cats can be quite playful and mischievous, so it's important to take precautions when setting up a Christmas tree. One way to keep your cats away from the tree is to place it in a room that they don't have access to, such as a bedroom or office. Another option is to place the tree on a sturdy stand that's heavy enough to prevent it from being knocked over. You can also decorate the tree with ornaments that are not breakable or dangerous for your cats.