I am going to look after my nephews piggies as he is studying for A levels n doesn't give them enough of his time. He has an outdoor hutch with a run underneath, he sits this on a big piece of wood which he then covers with decorative bark - this is only changed about every 4 months or so. This doesn't seem right to me, but I have never had this type of hutch. I can put it on concrete once they come to stay, do I need any thing else on the floor other than tunnels, toys etc? What does every one else do. Please help, sorry for being a bit dumb but I want them to be happy n healthy. Thanks