He’s pretty well behaved in the school and field but just takes it on himself to occasionally poke his nose out and walk back to the stable. Dd is nearly 9 and a nice quiet rider and they work pretty well together usually but she’s getting quite unnerved by him doing this. He has a soft, tiny mouth. Currently in a double jointed eggbutt snaffle. Has any one any suggestions. We’re working hard at getting him to listen to his rider but he’s like a tank once he gets something in his head.