Also if you're having trouble with saddle fitting, like I am with my thoroughbred, go onto the courbette saddlery website. They allow you to send them a withers tracing. Get a peice of wire/ or undo a clothes hanger and place it on the center of her withers and press down and make the shape of the withers and then trace the wire on a piece of cardboard or even a paper plate, & you can send it to courbette and they can give you the correct sizing of tree, etc your pony needs. I'm sending mine in this week.
Courbette Saddlery Company, Inc., Withers Tracing
I hope all this helps, your pony is a cute pony with alot of potential, and that Standardbred is a pretty bay! I like the jumping pic! He doesnt look like he's 18.