My cats and I tested the Litter-Robot 4 and Litter-Robot 3 Connect automatic litter boxes. Here's how the two bestsellers compare.

Learn more Keeping your cat's litter box clean is essential for ensuring their ... and don't need the smart features, the Litter-Robot 3 may be a great option. It can detect cats over 5 pounds ...

An average litter box is fairly compact—personally, our old one was 15 inches by 19 inches with 8-inch walls ... cat never ...

Before the Litter-Robot 4, I owned the Litter-Robot 3 ... boxes should be at least 1.5 times as long as your cat, giving them plenty of space to enter and turn around without touching the walls.