I have a very nice whelping/puppy pen. It has removable puppy rails that are 5x5. The box is about 6x10 and about 3ft high. It is very good when they get older so they can be kept in the box. It has 2 openings for mom to get in and out. I love this box but have to move and can't take it. I'm asking 75 as I payed more for it but may take a reasonable offer. If interested plz text . Thanks