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The first thing I would look at is how she's tightening the cinch. Is she doing it too fast? She might be catching some of his skin somewhere and pinching him. The most obvious sign of this would be to get a look at where the girth sits and also in his arm pits and see if he has any sores or rubs. Also have the vet out to check for ulcers. It doesnt sound like it would be a back sore issue, simply because he isn't being fussy while you're riding.
