Our new horse is a bit of a cribber. I'm trying to make a pasture that he cannot crib in. I've raised the canopy of the trees so he cannot reach them. The pasture is ribbon fenced with mostly flexible poles just pushed in the ground, but there are also PVC pipe poles for stability and they are at a perfect height for him to crib on. I was thinking of making those poles too tall for him to crib on (6 feet maybe). I don't know what would be left for him to crib on in there so, unless he started wind-sucking we should be able to turn him out without a collar and without worrying about him cribbing.