Sand Crack

A sand crack starts at the coronet band and works down, whereas a grass crack runs from the ground towards the coronet band. Both are caused by poor foot conformation or condition, poor or irregular farrier attention, or an injury.
Call the farrier for treatment. The cracks can be stopped from spreading by marking a groove in the hoof wall above or below the crack, or by putting clips around the start of a grass crack. With regular, correct farriery, the cracks should grow out.
To prevent cracks, ensure regular, correct farriery. A dietary supplement of biotin can also promote good hoof condition and growth.