A small space is best if you cant get a crate at short notice how about a box with his bed in somwhere he will be warm , A good tip is to put a hot water bottle under his blankets for added warmth at night and maybe leave a little light n for him too , dont expect sleep for a few night till he settles but try not to go to him too many times as this will teach him that if he cries you come running .

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