My horse was already shoed once I bought her, and recently she started limping. I cleaned out her hoof and didn't find anything. It went away after a couple days and now it's back again. The first time she started limping her back horseshoe came off completely, could this be the issue of her limp? The tricky part is though that her front leg is the one she limping on, not the one where the horseshoe came off.