In the battle of dogs versus cats, cats definitely get a notch in the "W" column for ease of care. Owners have to fill the food and water dishes and empty the litter box — by far the worst task for feline fans. Now, if there were only a way to eliminate that smelly task. Enter Litter-Robot, the self cleaning litter box. Its scoop-less, rake-less technology sifts through the litter and drops waste clumps into a drawer that's big enough to hold a few days worth of waste. Just pull it out and drop it in the trash.