I currently have wood shavings and hay but read about replacing the shavings for fleece which sounds good, but does anyone use an alternative to hay? My 4 new piggies have always been indoor but are outdoor now they are with me and I worry they might be cold. They get fresh hay twice a day but its always all gone or squashed when I go to replace it. What are your set ups and also what do you use for dens? Both sets have one of those plastic toilet things but they flip it over and use it as a den at the moment. I want to get them back to using them as toilets and replace them with a better den - any ideas? Thanks!