It's funny, because Miss Hoppy just is NOT a digger. Some of the things I read people do about digging (before I got my non-digging bunny) is nail corrugated cardoard - just several sheet of old boxes smushed down and glued or nailed to a piece of heavy plywood - it's cheap, easy to replace, and bunnies seem to like the noise and texture of the bumpy layers - AND, unlike nylon carpet, it's not bad if they ingest some. And Miss Hoppy does agree that cardboard is fun to peel apart!