Training the Mini Horse Dory

I ride every Tuesday and am hoping to show my school horse, Hope, in a training show in early July. I have performed the same walk and trot test for the past 2 years. This year I am going to show Hope in western dressage, Need to switch things up a bit. I have to learn to canter soon if I am going to show Hope in the canter test next summer. I have to canter for one year before I can test. My teacher has two mini horses. I hope to lease Dory beginning this month. I will train and show her (next year) in the obstacle course, walking over a bridge, and pulling a cart. I have watched a youtube video showing Peggy train her mini Mantra to pull a cart. It is amazing how seamless the training is. My horse obsession is an expensive hobby. My Dad says (when I tell him the cost to lease Dory, "That's not bad. It's a hobby, like golf." I may have to pick up an extra shift or two to pay for this expensive horse hobby of mine. Or have a yard sale.