northernmama: Biotin is that pellets, that I add to his food, if I can't find that what else should I try? I am keeping them clean,once a day I wash his hoofs and pick them out, dry them off and apply hooflex, there is no mud around here, just dry sand, I live in florida.
Biotin can be had in different forms. Check with your local feed dealer or vet. Personally, I would not use hooflex. Rather, try to keep an area where they actively walk very wet for them. The moisture in mud will help more IMO. Maybe near the water trough? Or salt block? Or somewhere they have to walk to get to shelter.