The Petmate Dog Exercise Pen with Door allows you to create a safe indoor or outdoor exercise area for your pet. The durable wire, solid hinge design is effortless to set up and folds down for portability and storage ease. Convenient door-in-door feature allows you to pass food and water through without letting your pet out of the pen. Available in a variety of heights and perfect for pets of any size. About Petmate One of the most respected and trusted names in the pet supplies industry, Petmate gave America its first airline-approved pet carrier more than 45 years ago. Through the years, Petmate refined the original carrier design, and by 1968 it began making the plastic kennel that"s become the industry standard. Located in Arlington, Texas, Petmate leads kennel sales worldwide, but it"s also an industry leader in pet feeding and watering systems, liter management products, and a wide variety of cat products. Petmate is dedicated to designing and manufacturing quality pet products to make your experience of being a pet parent more enjoyable. Expandable modular design for multiple configurations. Durable steel construction with a black finish. Step through door with secure door latches. Folds flat for convenient stowaway. Easy set- up, no tools required. Variety of sizes.