I agree that a rug is the best option if your bun will leave it alone and it's not too abrasive on the feet/hocks. Lick Blue Eyes said, low nap is good, as long as it's not too abrasive I prefer one that has a soft surface to minimize rubbing on the rabbits hocks. I have a microfiber rug for my buns that I really like, but they do tend to pull strands out of it every now and then, which isn't a problem as they don't try and eat them. Though if they did then I would take the rug out due to the risk of ingested carpet causing a blockage.