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    3. MENTAL STIMULATION

    Horses are exceptionally intelligent creatures, but a majority of them spend much of their time inside of their stables. Don't let your horse get bored when they're confined. Give them an exercise ball, a food trap toy or a plastic milk jug tied to a string so that they can play with it and stay sane while you are away. The more you provide mental stimulation for your horse, the less likely it will adopt bad behaviors and the more mentally stimulated it will be. (eHow)