02-01-2009, 01:24 PM
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Boredom (or more likely the fact that horses are geared to graze 14+ hours a day) can be a cause, as well as stress at being locked away from pasture mates, lack of forage, gastric ulcers etc.
Unless there is a very good reason to stall this horse, it would be a good idea to just leave him out at night. If he can't be left out at night then a grazing muzzle would be a good idea while he's in the stall to physically prevent him from chewing on things. And be sure to provide plenty of hay while he's stalled---preferrably in several areas in his stall to give him a little stimulation by requiring that he move around and look for it.