I was given the advice from a YT member to get the book called "Successful Dog Breeding" I have this book on order so I'm excited to get it.
Amazon.com: Successful Dog Breeding: The Complete...
My whelping box will be a large rubber maid tote and I will cut out a opening for mama to be able to get out. I will cut a small whole for the plug of the heating pad to be able to plug into the wall. The lid that comes off will make a easy access for cleaning and to check on mom and pups.