Cats scratch their claws for several reasons: scraping off the dead outer layer to get a sharper point, marking their territory with visual and scented marks, and stretching out their muscles and tendons to stay limber and agile. Unfortunately for your furniture, this healthy habit can lead a housecat into causing quite a bit of destruction. To keep their paws off your precious antiques without discouraging healthy behavior, it's best to get your kitty a scratching post all their own that they can rip up and shred to their heart's content.