I've obviously never raised a litter but, the breeder I was going to get my Corgi puppy from fed the pups raw from the time of weaning... which was about 4 weeks. At first, they got a pre-made raw mush with yogurt. It's the same as putting it into a food pan, so you'd have just as much of a risk of the pups rolling around in food if you fed kibble mush. After they could handle bones, they got rabbit or chicken. If they did roll in it, maybe you could just wipe them down with Nature's Miracle wipes or something?