What is the first sign of white line disease?

• A. Biotin
• B. Laminitis
• C. Hemorrhage
• D. Intercellular cement

Answer: (C)

White line disease begins with injury to the laminae that attach the hoof wall to the sole, and the earliest event is damage to the small vessels in that area, causing hemorrhage at the white line. This bleeding is the first detectable sign you’ll typically see, often appearing as a reddish discoloration or a small amount of blood along the interface when the hoof is examined or trimmed. It indicates that inflammatory and vascular changes are starting before the hoof wall begins to separate. Biotin helps overall hoof quality but isn’t the first sign; laminitis describes the underlying process, not an initial cue; intercellular cement refers to the bonding material that, once disrupted, allows separation but isn’t the initial finding.