My male guinea pig (3 months old) won't stop burrowing under the fleece! I put binder clips everywhere yet he still manages to get himself through! It makes me frustrated sometimes. I've tried many things to get him to stop but I don't know what to do. I've put another blanket in there he can run under but he still just goes right under the fleece. He ends up pooping and peeing under the fleece since he goes under it. Please help me find a way to stop him from burrowing so much.