Then check out these stylish accessories that will leave your cat "scratching for more." Finally, there is a company that does it right - The Company of Pets.com
They offer a silhouette cat scratcher made of graphite sisal (for walls or floors) and a sisal and manila rope cat scratcher in the form of "chairs" or a canine shaped cat scratcher. All are made using sisal and manila rope, all adhesives are non toxic.
Now you can go ahead and purchase that new sofa will less worry!