Vegan_Bunny
Warren Veteran
Both are too small for him to live in permanently. Minimum requirements are 6x2x2 with an attached 8x4ft run or pen. I would personally bring him inside. Is there no way you can let him free range at least when you are in? Do you have a spare room or a kitchen he can go in? If he isn't moving much, I'd be tempted to have him checked out by a vet. He may be suffering with arthritis. The cold will make this worse so he may perk up once he's brought inside.