I usually make critter cages out of PVC tubing and fish net/ or chicken wire, none of these would work for these critters with oppossible thumbs. The PVC is too light and they would just lift it. They will bite through chicken wire and of course, fish net. The problem is either making them so heavy that the racoons cannot lift them or have them fastened to the ground. I would suggest a small fence with secured cover made of pig wire.