Cats are naturally drawn to the biggest, most stable thing in the room and unfortunately your couch, among other furniture, meets those requirements.
To prevent destructive scratching provide alternate, appealing things for your cat to scratch on like scratching posts or corrugated cardboard.
Encourage your cat to use the posts by placing one near her favorite sleeping area and a second post near a prominent area.
A scratching post must be tall enough for your cat to scratch with his legs fully extended and sturdy enough to support his weight without toppling.
You can make the post more attractive by rubbing catnip onto it, attaching toys, or providing a more elaborate structure with climbing and perching areas.
Reinforce the use of the scratching post by offering your cat a food reward each time she approaches the post and multiple rewards whenever she actually scratches the post.
Remember we are always here to answer questions. If problems persist despite your best efforts there are other options (like placing plastic coverings over your cat’s nails) that are available from the veterinarian. We can be reached at 301-631-6900.