"The Clevercat litterbox has helped keep the beagle mix puppy out of the litter! It also has cut down on the odor from the litterbox and the actual litter that "spills" out of the box from the cats using it. It isn't perfect though as the dog can just stick it's head in the opening, but usually the waste is further back in the box. SPECIAL NOTE: We have three cats and our oldest has always been picky about the litterbox(ie location, activity going on around, etc) and in the three weeks we've had the Clevercat litterbox, she has NOT used it. Definitely keep your old one around in case you have a cat that won't use this litterbox."