A million years ago, I used to work for a guy who used to attend some of the cheaper auctions around and look for horses to upgrade. He got quite friendly with some of the local Amish and Mennonite families and sometimes they would offer him horses before they went through the auction. I went with him to pick up a horse one afternoon. Upon our arrival at the farm, we found a teenage boy working in one of the fields with a team: one huge old belgian and one young non-draft horse who was wearing harness as well as a variety of ropes around legs and neck and head. That young horse was not into participating but the Belgian just dragged him along! I was told it was the first day of training for that young horse and he would eventually give up fighting. I guess this is a similar concept to teaching calves to lead by tying them to donkeys?
I could certainly understand Theo being traumatized if he was “trained” in such a way…