The Aspen Pet Exercise Pen gives your dog room to roam without having to worry about him running off. It allows you to create a safe indoor or outdoor exercise area for your pet. The eight-panel dog pen is made from durable wire with a solid hinge design. It is effortless to set up. This metal pet pen with door allows you to pass food and water through without letting your dog out. It also includes ground anchors to hold it securely in place and secure door latches for safety. This item has an expandable, modular design that makes it ideal for pets of all sizes. The snap hook assembly also can be used to attach the pen to a wire crate.