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A lot of times sand cracks can be caused by the conformation of the hoof,
and/ or the balance of the hoof from trimming, i.e., too much toe out front,
etc. I know sometimes that going from wet to dry conditions, like a lot of
rain, then dry spells are rough on the hoof condition, too. It is a good idea
to have your farrier stop the crack before it travels up the hoof to the
hairline where it becomes a much bigger problem and can cause soreness. They
usually do this by taking a hot file and burning a line parallel to the
ground to stop the vertical crack from going up. It does not hurt the horse
at all.