06-06-2012, 03:34 PM
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My guess is that she isn't scared of anything - she is being dominant and is threatening you to get out of her personal space. Leading horses do not tolerate those of lower hierarchy to trot besides them, thus the pinning - it is a warning. You should work on your respect and ground manners - before she becomes even more dominant. I suspect that she may also push you with her shoulder while trotting (might seem like she's losing her balance and trying to lean against you) and nip at you - if she isn't already, then prepare that this behavior may happen.