@Kerya In this weather everything is harder to do. Looks like you have caught it early so maybe change out bedding I don't know if you can get pine shavings there but I like it, it is softer on the feet. I use heated buckets in winter and to keep mine from climbing into them I put a scrap piece...
-10 C is 14F no I am not smart I have a temp converter.
Looks like @Jenbirdee has given you good info. We have had temps down to 4* F this past week and -20 wind chills which is -15.56 C yuck , having good ventilation is very important at or around the roof line so moisture can escape ducks...