When I went out to the barn today and grabbed my horse, i noticed she was walking really slow. When i got her inside she seemed to be favoring her back right hoof a bit. So i put her on a lounge line and asked her to trot and i noticed a slight limp. So i grabbed my hoof pick and discovered that their was a piece of wood stuck in her hoof. I pulled most of it out but their is still a little bit left in her frog sort of like a sliver. I'm not sure if thats what is causing the limp though because i also noticed she has a crack in that same hoof and i think it's been there for s little while. It's not a serious one, but i don't know what will happen if i gets worse or what to do or which or if both problems are causing this mild lameness. Any help?