Our Oldest has been lame twice, once from a rock (small) lodged in the frog, second was per the Vet a strain upper leg. He had been bitten by a horse fly during a trail ride, and took off bucking. Vet had us apply heat, and medication (NSAIDs). The colt was lame once due to an absess, which was in the process of draining. We always call the Farrier, then Vet if one of ours is lame. Hope that helps.