Extra Large High-Sided Litter Boxes: What to Look For

An extra large litter box with high sides is a roomy tray designed to give a cat space to turn around while keeping more litter and urine inside the box. It can be especially useful for large cats, enthusiastic diggers, and cats that tend to urinate toward the edge. The best fit pairs generous floor space with an entrance your cat can use comfortably.

Check the usable interior floor, not just the outside dimensions: thick rims and sloped walls can reduce the space available to your cat. As a starting point, look for a box roughly one and a half times your cat’s length from nose to base of tail, then watch whether your cat can enter, turn, dig, and squat without crowding the walls.

Taller walls can catch litter kicked backward during digging and help contain urine aimed above the level of a standard tray. They cannot prevent every spill, so place the box on a washable mat and check for a secure, leak-resistant seam if it has a removable rim.

A lower entry opening makes a high-sided box easier to use without sacrificing wall height around most of the perimeter. Measure the entry against your cat’s mobility, particularly if they are a kitten, a senior, or have joint discomfort; a wall they must jump over may discourage regular use.

A smooth, nonporous interior is easier to scoop and wipe down than one with deep corners or textured surfaces. Before buying, check that your scoop reaches every corner and that the box fits its planned location with enough clearance for your cat to enter and exit without feeling trapped.

Some extra large boxes combine high sides with a partial cover, offering additional splash protection while leaving more open space than a fully enclosed box. If you are comparing those layouts, see the guide to high-sided and semi-closed litter box fit and access; prioritize a design your cat will actually enter and use.