Firstly, thanks very much for your “Sore Hocks” article I found on the Web. Flooring is the main thing to watch out for. Being as my back yard (indoor yard) where I keep the rabbits is tiled, a while ago the vet suggested I lay cardboard down in the sleeping area. At first there were a few objections, but after a few minutes they accepted it. I change the cardboard every few days – and I have had no more sore hocks.