Hi ardnaxela,

There are some really good suggestions under the help! My cats are destroying the wall. Topic under Cat Behavior, so you might want to check there as well...but for me, I use soft paws nail caps on my cat Marius. They work great! It might take awhile for the cat to get used to them, but once they do, you only have to reapply them about once a month since the cats shed their nails Check out www.softpaws.com for details about them. It's definitely a better alternative than declawing.
Also, maybe put up a scratching post somewhere away from the furniture that your cat is targeting. Put a little cat nip on it and praise your cat when he/she uses the scratching post. Soon, your cat will know to go there instead of the furniture.

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"In a cat's eye, all things belong to cats." - English proverb