For scratching, biting, and messing with the couch, tv cords, etc... there are natural sprays from pets mart, made with garlic and other things, that work great. They say to spray on object, but I find spraying a rag, than wiping the object works best. Don't, Please don't get the non-natural sprays or cat repellents, most of them warn of extream allergic reactions and if ingested go to the emergancy room, so they really are not something you want around your pet. Well, good luck!