07-27-2010, 11:35 AM
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Why do you suspect tansy ragwart? From what I've read, it can cause irreversible liver damage to horses and cattle so I can't imagine why it would be bailed for horses.
Has your horse been exposed to shows before or was this rather new to him. Odd behavior can sometimes be attributed to something new, especially with a lot of commotion going on - flags, lots of people, typical things at a fair. All that assuming that it wasn't physical such as grit under the saddle pad, or new tack, etc.