It's a bad habit she came with and I'm trying to break. I'm working on all possible solutions (pressure & release: I pull back on reins, cue her to whoa and immediately release and praise when she stops--except the second I lay off the reins she starts to move forward again. I combine that with leaning back, and walking her in tight small circles when she takes off again.)
I'm doing it all-except change her bit. Someone suggested I get a bit with more "whoa" to it, right now I'm using a eggbutt Mullen mouth.
Scarlet is 19 yo, and doesn't bolt or misbehave otherwise. She turns well in all gaits and is a mannered lady. It's just a matter of getting her to stop and KEEPING her stopped.
Any suggestions? I'm going bit shopping today --and of course, will use your advice! Thanks!