My OTTB gelding is now at the point in his training where we are beginning to lope the barrel pattern. He's been trotting the pattern great, no issues with this shoulder thing. But every once in a while at the lope he will drop his right shoulder on the far side of the 2nd and 3rd barrel and drift wide. And it kind of feels like he's bracing with his left shoulder/neck at the same time.
Part of this issue may be due to his conformation (club foot, low shoulder on the right side), but he doesn't do this when doing spiral in/out drills or at the trot. And it's not every pattern.
I've been working with a trainer, but she's a little stumped on this one too.