That is unconscionable. Get that restraining order. It's something that will be on his record and if he's ever convicted of a crime it will be used for sentencing enhancement, especially if he gets popped for something like domestic assault.
Now, on to little Yukon . . . He's had too many traumas that revolve around a crate now. I think you're going to have to try to go it without the crate, or at least without the door on it if he's ever going to forget about this episode. Make him a safe corner with a new bed and let that be his safe place. And no one uses a loud voice around him. Work on little things to rebuild his confidence; review his simple lessons that he's already got down pat, like sit and down - but make sure it isn't hurting his sore muscles.
You might also try the Bach's Flower Remedies. There are a couple that are very good for anxiety and fear in dogs. I can't remember the names right off, but it should be on most websites that offer the Bach's Remedies. That will be a start . . .