Regarding chewing, we had a horse that was “free-stabled” who would chew on any exposed wood and a young driving pair who would chew the bark off of red pines in the night pasture. A horse hauler from Canada told me to get a large bucket of Pennwoods (supplement) Blue and feed it through. The pair stopped after one bucket but the single horse is on a maintenance daily dose which has stopped the behavior. I suspect that he was missing something in his diet when he was off pasture in the winter. Pennwoods can be ordered on-line or through your feed dealer.