Made from a labor of love, our EZclassic whelping box is a high-quality, durable, and easy-to-use indoor dog whelping pen. It s made of strong-yet-lightweight injection-molded plastic and is easy to transport and clean. This box features walls that connect with high-strength extruded plastic posts that are tall enough to keep puppies from escaping.The EZclassic comes with a removable rail assembly that protects puppies from being smothered by their mother and has a front panel with a two-piece door that prevents puppies from escaping. The two-piece door allows you easy access to the puppies. This entrance allows the mother to come and go without feeling trapped. The durable box has a portable design, allowing you to move it from room to room with ease.