Originally Posted by travlingypsy
lol, I've never had them but I guess they would be just the packed snow that would get stuck in the horses hooves caused by him having shoes. Correct me if im wrong just my guess.
Yes, the snow goes into a snowball shape because of the shoes. I'm not sure if can happen in barefoot horses, but when I would take lessons, we would have to be careful because the lesson horses (almost all of them wore shoes) would get snowballs in their hooves.