The walls of our whelping boxes are not rigid. Corrugated plastic (polypropylene) is flexible, but tough and lig… | Whelping box, Dog whelping box, Whelping puppies
Plastic Small Whelping Box : 24" x 4' x 4' - Roverpet
Plastic Whelping Box - Whelping Box for Pets - Tekplas
Indoor Plastic Whelping Box : 24" x 4' x 6' - Roverpet
HEAVY DUTY PLASTIC,Whelping Box, XL,Xlarge 5' x 4' w/FLOOR+RAILS Dog,Puppy, Pen | eBay