I don't have a cat but this is kind of cool. Instead of declawing your cat or letting him/her tear up your furniture and walls, you can put these little things on their nails called soft paws. I don't know how vets' declaw cats nowadays but when I worked for a vet back in high school, when he declawed the cat he simply cut the nails below a certain point and they didn't grow back. The cat didn't experience much pain except they hate the bandages the vet puts on their paws after the procedure. When they wake up, they stand in their cages shaking their paws trying to get the bandages off.
http://www.softpaws.com/