Whelping Box for Puppies Birth with Pee Pad, Pig Rail, Adjustable Door, for Small Medium Large All Breed Dogs, 49" x 48"Spacious Pen: This dog whelping box measures 48. 75" x 47. 25" and is suitable for small to large breeds. It includes a pig rail to protect newborns from potential squeezing hazards from the mother. Easy Access and Security: With a height adjustable door, the mother dog can come and go safely while ensuring the puppies' security. This whelping box is sealed to provide the pups with a wind resistant living area. Sanitary: The whelping pee pad lining