Oscar started with sore hocks (baldness) no bleeding, I have just kitted the kennel with interlocking foam mats (fits like a jisaw), it's heavy duty, quite thick but easy to cut and fit, I got mine about 2wk ago from BnQ £12.98 for 4 large squares, covered area of 4ftx4ft bit more than that...in a dark grey.
I wipe them over too with a damp cloth when needed.
We have these. Got them from CPC online pack of 6 - quite cheap.