If your guy is not the type to adjust easily to change, then I'd start crating him again before the move, and continue it as a "security blanket" for a bit after your move. I would not put a dog in a new home with a dog door straight off the bat -- he might try to escape and go back to the former home.
You can also use Bach flower essence (Walnut) to help ease the transition. Just a few drops in the water bowl will do it.
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