Originally Posted by jtmdah
I had that problem with my thoroughbred. I switched to a tom thumb and it helped.
If your horse has enough rate you could also try a hackamore with better lift. Keeps you out of their face, but in control still.
I ride my horses in tom thumbs as well (although my arab is currently in a slightly thinner tom-thumb-type bit because she can be impossible to stop when you get her going!
Also,my friend's boyfriend owns a mare (hasn't ridden her in 4 years, though) that he had for years
& she had the dangerous habit of putting her head down & bolting. They put her in a hackamore & that seemed to help quite alot. It put more pressure on her face instead of her mouth.