Cats are curious animals, and they can get into all sorts of trouble if left unsupervised around a Christmas tree. Cats may try to climb the tree, chew on ornaments, or even knock it over. Additionally, some types of Christmas trees, like those that have been sprayed with artificial chemicals, can be toxic to cats. So, while cats themselves are not inherently bad for Christmas trees, it's important to take precautions to keep them safe and out of harm's way.