Originally Posted by DancingArabian
I think you should call your farrier and vet ASAP. That doesn't look good, and almost looks intentional but it could just be the way the picture it showing up for me.
^Definately^, and I'd be calling the farrier while the vet is on the way
to boot! That looks bad, and by golly, if I were a farrier and had a possibly incompetent assistant (only an assumption), I'd want to know. Despite that, I'd get it checked immediately - so glad you discovered it, poor boy!