Let Jasper run around the arena today. He really ran. He'd turn around at one end and bolt halfway across- he was pushing so hard with his hind end he left huge divots in the sand and roostertails behind him. Ears flat back, neck stretched out... his butt must have dropped 2 feet. He'd charge to the other side, come to a leaping stop, turn, and repeat. It's the most Thoroughbred he's ever looked. He wasn't upset, or out of control, or crazy, he was just running.
When he was done he came trotting across the arena, stopped, and turned to me.
And his tongue? His tongue was in and out and in and out and flapping around in the wind. His tongue and mouth never quit moving. I'm beginning to think it's not a bit issue, it's a tongue issue.