We tested Modko's Modkat Litter Box (new in pikn) with four cats, and they all gave it four paws up. Its design screams luxe living, but though some modern pieces beg the question “How does it work?,” our tester kitties dove right in. “They track a lot less litter around the house because it falls back through the perforated top when they jump out of the box on to the top,” our reviewer reported. The “rooftop access” has another benefit: It keeps the litter off-limits to curious canines. Sturdy and easy to clean, Modkat has an ergonomic scoop with an incorporated brush that stows neatly on the side, as well as a reusable litter liner, and the top flips open at the press of a button for easy removal.