The depth of litter in the box significantly influences a cat's willingness to use it. Generally, a litter depth of 2 to 3 inches is ideal, providing enough material for cats to dig and cover their waste, which is a natural behavior. Too little litter can make digging unsatisfactory and may result in urine or feces sticking to the box's bottom, discouraging use. Conversely, too much litter can be overwhelming and uncomfortable for some cats. Maintaining an appropriate depth helps ensure the litter box remains inviting and hygienic for regular use.