These heavy-duty Exercise Dog Pens are economical and convenient. Great for use at home, on the road or at shows. Completely portable with sturdy 9 gauge wire. Two or more Exercise Pens can be joined together for added play and exercise area. Optional Galvanized Ex-Pen Anchoring Stakes are available for outdoor use. Each can be made into a 4'x4' square as well as an octagon shaped pen. Folds to suitcase size for easy storage.