Had you been tid bitting him and now he is expecting it? Someone on our yard did and her horse was getting pushy she was advised to pinch his lip next time he did it and also cut out the treats? I think it stopped it :-)
Dear all I have recently bought a welsh sec d 2 year old colt the lady admitted she had literally done nothing with him he came with head collar on which I haven't removed we had problems loading Him but eventually got him on and back to his new home which he settled in great he's in a paddock...