I have just posted a message on the Horse Care board regarding the Vicebreaker (see Message board-horse care), The horse I ride is just the same, lovely in every other way except in the stable.
It could be that in the past someone has hurt him while rugging up or tacking him, or it could be a territory thing which is what we think causes our horses terrible behaviour. I try to discourage his aggression by pushing him away and shouting "NO!", then fussing and praising when he is lovely and cute, which he can be!!
The only thing to do is be very very patient. You must also be consistent, and make sure anyone else who handles your horse is aware of what you are trying to achieve. Good luck!
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