02-09-2013, 01:42 AM
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'When someone's on him OR going into a trot' sounds like it's more likely a pain issue than a leading problem. First thing I'd rule out is saddle fit issue. Also especially if his back's sore, regardless of a comfortable saddle, if someone's bouncing on his back at a trot, this will be annoying, at the least for him.
So, regardless of the issue, I wouldn't be putting kids on him & if you rule out pain/discomfort & conclude that it is indeed a behavioural thing, if you're frightened to discipline him when kids are aboard, don't put kids on him, but get a good working relationship going with him with an experienced rider first.