All my rabbits have a box in their wire bottomed outdoor hutches. The boxes I just made have no bottom and I just set them on the wire bottom of the cage. I'm doing this to see if they pee or poop in them before I put a bottom in or bed them with hay and straw. My question is: will they get cold with no bottom in their box? I suppose if their bedding stays dry they won't be cold. We are looking at 29 next week for our lows so winter is on it's way.