A couple of days ago I decided to take him outside. At first he forgot everything, but within a few minutes he was driving like a pro! This video (below) is sort of long, almost 5 minutes. It shows him turning easily, standing well (notice all the GREEN GRASS that he is not eating!), and backing.
* Two days later, I had my dad (Wes Licht) out to assist with Diesel's first hitching to the cart! It went very well. Diesel did a few rounds at walk and trot, got a few carrot treats along the way, and we unhitched.