Originally Posted by PumpkinzMyBaby22
Once you have done what nrhreiner suggested you should be able to get the correct leads. If it still does not work, a circle in a steady, controlled trot just before the transition should help him pick up the correct lead.
a circle is a good thing to start your canter with because your horse is already bent in the correct direction. Trot a circle tracking left get a nice steady trot and a good bend all the way threw your horses body. Ask for the canter on the left lead by applying your outside leg (your right leg) behind the girth. And he should step up into the canter on the left lead. For the right lead do the same thing trot to the right and when you are ready for the canter apply that outside left leg and he should bring up that right lead. You ask with the opposite leg because the first leg a horse steps up into the canter is their back leg. For the right lead their left hind leg will be the first to start the canter and vice versa. Soon you can ask on a straight away and depending on what leg you cue him with is what lead he will bring up.