They need to be Coop Trained. If you Google "The Chicken Chick, coop training" you can read how. It's easy and winter is a good time for it.
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How about stacking cinder blocks under the coop. You can stack them, put rebar in the inside of the blocks and add cement. Viola! Super sturdy legs. Go to Home Depot, lowes hardware store and ask for instructions they'll help you. Alternately you can ask them for other ideas for some high legs or something to raise the coop up. Good luck.