I haven't tried it, but there's something called Sticky Paws that does not harm your furniture but repels your cats because they don't like to touch sticky things. You can get it at Petco and PetsMart, as well as in pet supply catalogues. I've heard good things from people who have tried it. I will soon because since I have moved my couch it has become very attractive to my 20-pounder and his giant talons!