10-26-2012, 12:41 AM
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We need photos if you would like any specific information. See the link in my signature below for what's needed.
Basically no, a horse shouldn't need shoes for a crack & I do believe sometimes it can make matters worse to hold together the bottom of the crack & yet put more pressure on the walls. Especially if it's the entire length of his hoof capsule, he may need it braced though, with a strap type affair across the crack.
There may be infection present which is perpetuating the crack, so this will need to be cut out. There may be hoof imbalance(eg. Wall too long in the region) perpetuating it. If it's been long standing & through the coronary border, there is likely to be always a 'fault' or 'divot' there, but generally you can still mend the crack so that it won't affect the hoof strength/soundness.