Originally Posted by kevinshorses
Cantering undersaddle will probably be easier in him than lungeing him at a canter. At three, in my opinion, a horse is mature enough physically and mentally that they can handle a little cantering. I don't lunge horses much so I can't give you advice about slowing down the canter that is specifically for lungeing but I will say that if you can control the speed of the walk and trot then you will be able to control the speed at the canter. I don't mean just getting a slow trot but being able to speed it up and slow it down. I find it much easier to control a horse when I have my legs on either side and a hand on each rein rather than standing several feet away with a whip and a line.
I agree with kevin... as usual.
Right now though I wouldnt worry to much about speed. You don't want him runing around like a bat out of heck but just a nice consistant canter. Right now he needs to learn to find his balance at the canter. Remember he is still growing so he may become off balance once in a while.