I use the dog kennel pens for my pheasants and chickens. The tops are covered with 2x4 welded wire and then fiberglass panels for protection from elements. goldens in a 6x10 (happy and giving me fertile eggs, 1st chick hatched 5-12). Amherst in 6x10 but will be getting a little larger one this weekend. And tragopans in 5x10 (also getting larger this weekend but I hate to move as the hen is laying, but the male is too young). I have not had a problem with the size or tops and in my area of eastern Pennsylvania I need the extra protection to deter bears. So far no problem with them. The fiberglass panels are to keep the birds out of the view of the Red-tails and eagles in our area. They are always on the hunt. Kerry