Make a quick trip to your vet an he will have the equipment to get to the problem an then give it what it needs ....We live fifty miles from the vet ,so it isn't like doing it on your way to coffee , so what works for us is a chelate mineral 13-13- with a package in it that takes care of it. We use to have bad problem ,we graze some boggy hay meadows every year ,not enough crosssings in it either to help them
stay out of it going to waater ..Also use to have lots of eye problems an have taken care of it ,some use terramycin in mineral but someone said by next year that might be off market ....Our mineral runs about 975.00 a ton right now , I don't know about you guys but I'm a old timer an had lot's experience doctoring foot rot over the years an if I was doing any now I think I would be worth about 40.00 dollars an hour when we leave the house ...