My pony, Cloe used to have the same issue. I just did a lot of giving to the bit exercises with her whenever she would want to become boss :roll: . A lot of transition work is good, too. Or, if the horse wants to go, maybe just let her rip. I know horses get bored sometimes and just need a fun day, so maybe if she is feeling speedy that day, go out for a nice fun, care free, gallop kind of a day.