Contour exercise pens by Midwest Homes for Pets are a great solution for your pet to get exercise or have a play area while being contained. Designed for the safety, security, and comfort of your dog, Contour Ex Pens set up easiyin. seconds without tools and have a safe and secure lift door systemin. addition to the slide bolt latch. Contour Exercise Pens easily fold down flat for easy storage and come with ground stakes.