I know people in condos who have dogs they have trained to go in litter boxes like cats. I dunno, it seems kind of undignified to me. There's also "pet grass", patches of real grass for your dog ...
To keep your dog from eating cat litter and poop, get a top-entry, high-walled box, raise the height of your box, or place the box in a room or area your dog can't access. Read more: Here's How To ...