It's currently +2 centigrade outside.
Looking on many rabbit websites, the netherland dwarf seems to be able to cope with this, as long as he has plenty of straw, hay and sawdust. He has plenty of both, although prefers to sit in the open bit, where he's made a circle on the floor with no bedding underneath him. But the option is there.
DH has suggested bringing him in for an hour or so, to run around as it is nice and warm inside. I'm wondering whether this is wise if he's going back outside to the cold?