I ride a horse for a friend of mine and his name is Red. I went to pick out Red's left front hoof on Thursday and found this weird thing on his heel. I'm pretty sure it wasn't there when I groomed/rode him on Tuesday, or at least it wasn't this visible or I would have noticed it. He was fine with me touching it, but when I started to put pressure on it, he flinched and tried to pull away. He wasn't lame at the walk and had a normal walk, not stilted or hesitant. I know that his feet are awful, but I can't do much about that. XP He's kind of just a pasture ornament and I doubt he's seen a farrier or vet in a very long time. =( He's at a place where it gets a lot of rain, but it also takes a long time for the water to drain away, so his feet are in wet grass most of the time. I hope you guys can help me figure this out as I'm getting really worried.