I was out of town for several days, so when I came back yesterday and cleaned Jemma's hoofs the frog on front looked somewhat strange. Basically it's not like a gray rubber (when you use farrier knife), but like white little pieces. Like bread crumbles I'd say. I looked for definition for thrush, but it doesn't look like one (although I did put Koppertox anyway). Any ideas on what it could be?