I have two baby guinea pigs outside in a hutch. They have plenty of hay and bedding in their nesting area and a hutch hugger cover. I think we are due a few cold nights - around -1 to -2 and wonder if they will be ok outside? It was mildy frosty when I checked on them this morning and they absolutely fine and nibbling on the hay I don't have an indoor cage as I don't have the room and if they did come in they'd have to be in a box or carrier. Will they be ok outside?