Go to Home Depot/Lowes and get a vinyl flooring remnant. Lay it out on the floor and put the whelping box on it to hold it down. The vinyl will be much easier to clean and better for the puppies. Then you can put something on top of that to serve as bedding. I would not use hay/straw/chips. Use blankets, carpet, etc... something soft. We have large fleece pads that we spread out to use. For the first few days you want to make sure that the puppies cannot get tangled up and trapped in the bedding, or get under something and get crushed because the dam can't see them. So it's best to spread the blankets/carpet out and then put the box on top of it to hold it down so that they can't get bunched up and trap a puppy.
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