I dont think putting the horse down is even an ohkay suggestion. That's ridiculous, telling her to sell him would be a better suggestion. How do you even know that him bein proud cut is the reason?
Me personally, just working on what you said is his biggest problem in your opinion, I'd walk him thru a gate 200 times- & every time he kicked I'd swat his legs with a dressage whip. When he listens, make him turn, face you, & stand before you even THINK of unclipping him. That's where I'd start. He needs to respect you first, before anything else.
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