Real grass sod dog potty or litterbox DIY. Step 1- get two jumbo cat boxes or shallow plastic storage boxes and drill small holes in the bottom of ONE. Step 2- put a few small stones on the holeless box and a shallow layer of stones in the drilled one. Step 3- put a layer of dirt over the stone layer in drilled box. Step 4- lay sod cut to size on the dirt. Step 5- water frequently and trim as needed, empty out holeless drain box as needed.