After doing some very light work, when i say light work i mean trying out his new boots and just doing a few ground work exercises and a short walk over the stones and up the concrete drive Marley's hind feet (without the boots) looked as though the seperation between the outer wall and inner wall had seperated a bit more. I got the rasp out and rolled the edges some more so that the seperation was flush, he isn't sore on them or anything i was just wondering if i keep rolling the edges so the seperation is flush will it prevent it from seperating even more and is it normal for it to have seperated a little more considering it was already there? Also is it likely to stop once the hoof since not having shoes on has grown from top to bottom? I'm going to start scrubbing them some more with a light solution of hibiscrub or milton to see if it helps like you've already suggested. His front feet on the other don't seem to be doing too bad its just in wet weather the soles get very soft and chalky, i actually think there may be some false sole as quite a big flap came off the other day.