When I adopted my cat from a shelter she was not declawed so I did some research on how to keep her away from the furniture. Besides the sticky tape scratching posts are a must. Not short ones but tall ones, about 36" high with sissal rope not carpet. My cat loves to stretch the full length of the post. The other piece of advice is to be sure there are scratching posts in every room the cat sleeps in as it is common for them to wake up and immediately want to scratch.

My vet had a theory, although she didn't agree with declawing, if it kept the family happy it was a better alternative than the kitty ending up in the shelter.

My kitty was very well trained and seems to understand that the scratching posts are "her" furniture and she hasn't gone after anything else.