Scenario #1: It’s time to shoe the horse. You pull the shoes, trim the feet and shape the shoes. Just when you are ready to nail one on, you notice a small cavity just inside the white line. Picking it with a nail shows a white, powdery substance coming out. You scratch some more and your nail goes part way up the hoof wall. Chances are you’re looking at WLD.
Scenario #2: Pulling the shoes, you notice hoof wall separation where the sole meets the hoof wall. Probing with a nail you notice that separation goes much higher up the hoof wall. Chances are you’re looking at white line disease.
Scenario #3: The owner reports on and off lameness. The feet and shoes look good and so do the legs. You do a hoof test with testers but nothing shows up. Tapping on the hoof wall reveals a suspicious hollow sound. The vet’s called in to shoot some radiographs that reveal a cavity in the hoof wall. You may be looking at white line disease.