I was checking my horse's feet today and I noticed a black streak on the sole of his left front hoof, which happens to be a club foot:
(sorry about the snow, I had a hoof in one hand and my phone in the other )
Not sure if you need a couple conformation shots, but here are a few just in case:
I can hop out and take any more that are needed (if needed)
I don't think it's a bruise since it's not red-purple, and there's no hole for an abscess. Should I be worried?