Whelping Pen for Medium Puppies: Designed for medium-sized dogs, with dimensions of 1865 x 970 x 500mm / 73.43 x 38.19 x 19.69 in, our dog whelping box offers a spacious and comfortable growth space. Please check your dog's weight, height, and length before purchasing. Durable and Long-lasting: Made of high-quality PVC material, this dog whelping pen is waterproof, rust-resistant, and designed to withstand long-term use without deformation or aging. The flat panel design makes cleaning easy, creating a healthy, secure, and stable environment for your pet. Adjustable Door Height: The door height can be adjusted by 6 in to prevent newborn puppies from escaping, 12 in for easy access for the mother dog, and 18.1 in to stop both mother and puppies from climbing or jumping out. Puppy whelping supplies provides comprehensive security for dogs at various growth stages. Large Waterproof Pee Pad: This anti-slip pee pad measures 44.1 × 44.1 in / 1120 × 1120mm, offering a larger surface area. The cotton and waterproof layer prevent leaks. Machine washable and reusable. Expect a natural shrinkage of 4-6 cm after washing, which is normal. Simply stretch the edges to restore it. Clear Leg Markings: The dog birthing box features laser-etched arrows on the legs that provide clear directional guidance for easy and accurate installation. This helps avoid installation errors and makes assembly quick and hassle-free.