Compared to housebreaking a dog, training a cat to use a litter box is relatively painless. That is, of course, unless your feline is finicky about litter or has health issues that cause more frequent bathroom breaks. Cat parents have two types of litter to choose from: clumping and non-clumping. Clumping litter turns urine and feces into scoopable clumps. It also tends to track less and better contain odors. Most litter boxes are compatible with it—some boxes, like the Litter Robot 4, even require it. When it comes to clumping litter, there are almost too many options to choose from. We researched some of the best so you can pick from the cream of the crop. Our favorite is Dr. Elsey’s Premium Clumping Cat Litter Ultra because of its allergy-friendly low-dust formula and high odor control. But keep reading if your cat has allergies, is a kitten or you want to experiment with some plant-based options.