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"Recognize the appearance of thrush. Thrush will appear as a black, tar-like discharge that emerges from your horse's hoof. A horse's hoof afflicted with thrush may appear to have deeper than normal grooves (sulcus) along the sides of the hoof's frog. The affected part of the hoof will most likely have a foul odor, which is one of the most common characteristics of thrush."
<https://www.wikihow.com/Treat-Hoof-Thrush>