We have had this pony for about a year now, and are steadily progressing, but we have suddenly encountered a halting problem - ie she won't, not in the school anyway. She will stop if someone is in the school with her but that's not much use in a dressage test! Any thoughts? She just resists. We've tried doing lots of transitions on the track, and she will halt there, but not down the centre line. A small M&M pony is pretty strong compared to my 12 yr old daughter! She has always been ridden in a snaffle and I am reluctant to change as she doesn't bomb off.