Pet Playpen - PT900. An attractive, well-built alternative to metal indoor kennels, this sturdy pet playpen features easy visibility and access, great for new puppies or for nighttime use for older dogs. The thick walls are made of tough polyethylene that will hold up to claws and teeth and are easy to clean. Plus the playpen features a hinged door that swings either direction and has an easy one-handed lock. Corner skid protectors prevent damage to your floors. Simple assembly required.