When I got Teddy he was pretty shut down. He was also super worried about doing the wrong thing. I know the person who trained him, and I'm pretty sure he got punished for doing the wrong thing. What I did was just spend a lot of time hanging out with him at first, and not asking him to do much beyond lead from here and there. Once I was ready to really start working with him, I only asked him to do things that I knew he could do, and I praised him and rewarded him lavishly. Then I started asking for more, but only in a situation where really his only realistic choice was to do the thing I wanted him to do. Then I'd praise for that. Eventually he relaxed, but I don't think he'll ever not be a little shut down. His trust had just been destroyed. I got a lot of it back, but I don't think anyone will ever get it all back.