My friend have a nice black rabbit, it lives in her back yard in a nice two level hutch. Its now getting extremely cold out there, last check it was -6c ,she have tried to look what the minimum temperature is for a rabbit outside safely but cant find any info on the net. she can only bring it in and was wondering if a)the rabbit can survive at -6 or b) would the shock of bringing it into the warm house do her harm? any advice would be appreciated.