My Herdwicks had a lot of foot problems when I first had them, mostly shelly hoof, but since using Golden Hoof they have been much better. I put them all through a foot bath once a year and I definitely reckon it hardens up their feet. Also if one has a bit of a limp I hold the offending foot in a small bucket of Golden Hoof for three minutes and that almost invariably cures the problem within 24 hours or so. I think they know now that it is in their interest to stand still while I am dunking the foot, but it does seem to kick in after about 30 seconds and they have a bit of a wriggle to test my strength v theirs. Often just getting the foot really well soaked also makes it easier to see what's causing the problem or to clean out under the hoof wall. I would definitely recommend G Hoof - great stuff!