Large Size: A spacious size allows you to use this welp box for large breed dogs, small breeds, and medium sizes, ensuring versatility. Two-Room Layout: The whelping box for puppies is divided into two rooms to provide an ideal environment for a new mother, allowing her to get her own space when she eventually needs it after the first two weeks are over. Three removable doors, including one in the middle, let you provide open access between areas. Airflow & Wind Resistance: The right side has fences that allow for airflow and a clean environment for the mother dog, while the left side is sealed to offer a wind-resistant habitat for the pups. Pinewood & Non-Slip: The pinewood walls and railings are tough and durable for extra strength. Non-slip pads underneath ensure stability. Dog Whelping Box Info: Overall Dimensions: 81" L x 39.25" W x 19.75" H. Single Panel: 12.5" W x 6" H. Assembly required. Please note that dog pee pad is not included.