This section is from the book "The Stable Book: Being A Treatise On The Management Of Horses", by John Stewart. Also available from Amazon: The Stable Book.
Young idle horses sometimes set their fore-fret into the manger, for the purpose, I suppose, of looking about them. This can rarely happen when the manger is at the proper height, and the halter-rein of the proper length. When a horse is observed in this situation he must not be rashly struck to bring him down. Go to his head, loose the binding, and set the horse back, keeping his head well up, and rather off you. I remember a very troublesome horse that had a trick of leaping into the manger. One day he had been put into a strange stable where the mangel was low, deep, narrow, and sparred across the top. He got into it, and resisted all the keeper's efforts to get him out of it. He could not, or would not descend. Two stout pieces of board were procured, and laid across the manger top. By placing first the one foot and then the other upon these boards, he was brought down, merely by pushing him back.
 
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