Thanks Poppymoon.
He's eating well. Think we'll keep him caged tomorrow instead of putting him in his run. Might do more strain to it out there. We have a heat pad to put in tonight (he's an indoor boy, but my other half is worried he's feeling poorly) so we'll lean that against the wall of the cage so he can lean there if he wants. He's getting old now, he's at least five, so we worry.