Has anyone found any useful products to lay/stick/put down by closed doors so that the cats don't shred the carpet trying to get in? I am going to try to close more doors in the house to keep the heating bills down but know that the dcats will not be happy - they seem to think that they have a god-given right to go in all rooms (apart from the ones where doors have always been closed since they were kittens) so I need to extend our boundaries of rooms that are of no interest to them (because they are never open) but in the meanwhile need to protect the carpets. Any ideas?