It is very difficult to ascertain what may be causing the condition you are describing without seeing the horse and knowing more about the overall management of the horse. One obvious possibility as to the cause is that the horse may have genetically poor quality feet; however, if the feet are growing and maintaining well while barefooted, that may not be the case. There could be many things with the shoeing that could be problematic, beginning with the nails being placed too low or being driven into the wall too close to the edge. Moisture certainly could be a problem. The shoeing interval may need to be shortened. You don't specify if shoes with clips are being used. Clips can help in many instances, but many eventers do not like to use clips. Glueing shoes on can be very beneficial if done properly. Many equine athletes use glue-on shoes, including race horses, jumping horses, eventers, dressage horses, etc.

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