Throughout this 15-minute session, once Atty was on the trailer and treated, I walked back and hooked up the butt bar. Then I walked forward and treated him some more. Then I went back to unhook the butt bar to let him come off if he wanted to. If he didn’t come off on his own, I waited a minute and then asked him to come off. If he backed into the butt bar calmly and walked forward again or did when I asked, clicked and treated.