One of my cats used to love digging at furniture. I have multiple scratchers and a cat tower for him now. I clip his nails and keep cat nip on his scratchers and cat tower and I have never had an issue again with him digging. He still stretches with his claws out on the side of my couch but that's it. I have in tables on both sides of my couch so he cant really get a good angle on the sides of the couch. A cover is a good option or sticky tape and claw caps are as well. There are also repellent sprays you can spray on your couch that will not smell good to a cats sensitive nose. Declawing is never an option in my opinion. I'd rather had a destroyed couch then get rid of my babies or rip their claws out. Sometimes it's just a part of the package and should be something that is thought about before getting deciding to get a cat. I will never understand why ppl declaw. It's like feeding a vegan diet because you don't believe in killing animals. It's just silly and if you didn't want an animal with sharp claws that needs to scratch to stay happy or eat meat to stay healthy then why get a cat to begin with?