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I own a 15 year old paint quarter horse and do jumping and flat work with him. recently when i have been tightening his girth to secure the saddle he turns his head and nips at me. He has had emergency colic surgery before and this is the first time he has ever done this...its been reacurring for about 2 months now..what do i need to do?**he had surgery 4 years ago***and i have also tigheted in incrementshe already has a chipracter, i ride him in our field cause we have no arena, and i only jump him once a week.