Muzzle him whenever he is around the horse for starters.
I 5th the shock collar! We trained my rottie (who we pts in February) with one. We enlist the help of a trainer so we knew how to properly use it. The ONLY time we used it as an end all be all to something was in the car when he used to bark at ANYTHING in the road. It only took ONE time with a heavy shock from the collar and me yelling at him like a lunatic for him to totally stop the behavior.
Just like any training tool, whether its a collar, bit or food, it can go seriously wrong with the wrong operator behind the controls!! There is nothing wrong with an e-collar if you know how to appropriately use one!
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