White Line Disease is a fungal infection of the white line (or lamina) on the bottom of the horse’s hoof. White Line Disease is a widening of the white line, or a separation of the hoof wall from the sole. This separation is then invaded by bacteria and fungi, leading to infection that progresses up towards the coronary band which produces a white or gray powdery material. It is usually first noticed by the farrier during a routine trimming because only severe cases actually cause lameness.

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