Join Date: Feb 2010
Location: Bathurst, Australia.
Not necessarily a pacing issues, just confused, your aid wasn't strong and clear enough, or she;s excited
Just change direction, leg on, and ask "trot, trot, trot" and when she goes back to trotting reward and praise. Keep changing and asking until she stops trying to canter. If she is IN Canter instead of doing the half canter/half trot, ask for the trot, reward and continue on. Always just bring her back and praise, then whenever you ask for a canter be clean and CLEAR.
This may not work for your horse, but it works for mine ;)