[Billcat]

A friend suggested using double-sided tape to fix balloons to the sofa. When the cat goes to scratch, bang! And a quick retreat to the other end of the house.

Also I keep a can with a few coins in it handy. When Barnaby starts to scratch the furniture, I shake it vigorously, which he hates. Took a while, but he seems to have given up on the sofa.

Also, rubbed catnip on his scratching post. He now (finally!) seems to prefer scratching the post. Of course, he's a bit loopy after, but it beats paying for a new sofa.