Emily ParkerBy Emily Parker

Updated November 2026

Cat litter boxes for large cats need more floor space, a deeper and wider interior, and an entry that is easy to step into without stretching or climbing. In this guide you will learn how to measure your cat, judge the right box dimensions, decide between open and covered styles, and set up a box your cat will actually use. Most problems with big cats come down to a box that is simply too small or too hard to get into.

Why Large Cats Need a Different Kind of Litter Box

A standard litter box that works well for a 9-pound cat can feel cramped to a cat that weighs 16 or 18 pounds. When a cat cannot turn around comfortably, cannot lower itself without its back legs hanging over the edge, or has to brace its front paws on a rim, it often starts looking for a better spot. Owners of big cats frequently describe this as the first sign that the box, not the cat, is the issue.

Shopping for one? See our guide: 5 Best Cat Litter Boxes with High Sides for Messy Cats (2026).

Size is only part of the picture. Large cats also tend to be heavier on the litter, so a shallow box can spill litter onto the floor with every stride. Choosing a box with the right footprint, height and entry is what keeps the bathroom area clean and the cat comfortable.

Step 1: Measure Your Cat

Before shopping, get a real measurement instead of guessing. You will need a soft tape measure and a helper if your cat is cooperative.

  • Body length: Measure from the base of the neck to the base of the tail while the cat is standing or lying flat.
  • Turning space: Note how much room your cat needs to spin around. A good rule is that the box should be at least 1.5 times your cat’s body length, measured from the inside wall to the opposite corner.
  • Step-in height: Measure the height of your cat’s front shoulder when standing. The entry should sit no higher than about two-thirds of that height so your cat can step in without a jump.

Step 2: Choose the Right Box Size

Many large-cat owners choose a box that is roughly 22 to 30 inches long and 16 to 22 inches wide. Jumbo and extra-large models are sold for exactly this reason. The best size depends on your cat’s body length and how much room it likes to move around in.

Cat Body Length Suggested Interior Length Suggested Interior Width
Up to 20 inches 22 to 24 inches 16 to 18 inches
20 to 24 inches 24 to 27 inches 18 to 20 inches
24 inches and up 27 to 30 inches 20 to 22 inches

These are general targets based on common guidance from cat behavior resources, not strict rules. If your cat is particularly long or muscular, go to the larger end of the range.

Step 3: Pick the Right Entry Height and Sides

Entry height matters as much as overall size. Look for a low front lip, ideally under 4 inches, so your cat can step in without lifting a hind leg high. If your cat tends to kick litter out, a higher back wall or side walls around 6 to 8 inches can help. Owners who need extra containment often look at high-sided designs, and you can read more in High Sided Cat Litter Boxes: How to Choose the Right Height for Your Cat.

Top-entry models can work for some large cats, but they are not ideal for every individual. Some cats dislike dropping into a box from above, and others find the opening too tight for their shoulders. If you are considering this style, compare options in Top Entry Cat Litter Boxes: 7 Best Picks Compared (2026) before buying.

Step 4: Decide on Covered or Open

Open boxes give large cats the most room and are usually the first choice for big cats. Covered boxes contain odor and litter scatter but can feel confining. A covered box must be tall enough and wide enough to meet the same size guidelines above. Many owners find that a large open box with high sides is the best compromise. Keep in mind that a hooded design that is too small may cause your cat to avoid it entirely.

Step 5: Choose Litter Depth and Type

For big cats, a litter depth of about 2 to 3 inches is usually enough for good coverage without making the box feel like a sandbox. Too much litter can make the floor of the box feel unstable, while too little leaves waste exposed. Clumping litter is easier to scoop, but if your cat has a sensitive paw or tends to track, a softer texture may be more comfortable. For a broader look at choices, see How to Choose Cat Litter and a Litter Box.

Step 6: Place the Box Correctly

Location affects whether a large cat feels safe while using the box. Place it in a quiet area with at least one clear exit, away from the food and water bowls. Avoid spots where the cat must squeeze past furniture or a tight corner. If you have more than one cat, a general guideline is one box per cat plus one extra, spread across different areas. How Many Litter Boxes Do You Need and Where to Put Them covers this in more detail.

Step 7: Set Up a Realistic Cleaning Routine

Large cats produce more waste, so a box can fill up faster than owners expect. Scoop at least once a day and plan a full litter change on a regular schedule. The exact interval depends on the litter type and the number of cats in the home. A simple routine helps you notice early changes in urination or stool, which can be health signals. For a sample schedule, read How Often to Scoop and Change Cat Litter: A Cleaning Routine.

Several products can make a large-cat setup work better, especially for larger cats or multi-cat homes.

  • Jumbo open litter box with high sides: The extra floor space and wall height help contain litter from big cats that dig or kick. View on Amazon
  • Extra-large covered litter box: A roomy hooded design offers privacy and odor control for cats that prefer enclosed spaces, as long as it meets the size guidelines above. View on Amazon
  • Litter mat with textured surface: A large mat placed in front of the box catches tracked litter and protects floors. View on Amazon
  • Litter scoop with large capacity: A deep, sturdy scoop makes daily cleaning faster when the box is wide. View on Amazon

Tips

  • Watch how your cat enters and exits the box. If it hesitates, the entry may be too high.
  • Try a clean box with fresh litter before concluding your cat dislikes it.
  • Introduce a larger box gradually by placing it next to the old one for a few days.
  • Keep the box away from loud appliances and high-traffic doorways.

Common mistakes

  • Buying a box that is only slightly bigger than a standard size. Large cats often need a noticeable jump in length and width, not just a few inches.
  • Choosing a high entry for an older or arthritic cat. Low entry points are safer for seniors and heavier cats.
  • Using a covered box that is too small. A hood that squeezes the cat can cause avoidance.
  • Ignoring litter scatter. Large cats kick more litter, so skipping the mat or high sides leads to constant cleanup.
  • Waiting too long to clean. A full box is a common reason large cats start eliminating outside it.

FAQ

What size litter box is best for a large cat?

Most large cats do best in a box with an interior length of about 22 to 30 inches and a width of 16 to 22 inches. Measure your cat’s body length and choose a box that gives it room to turn around comfortably.

Should a large cat use a covered or open litter box?

Open boxes give more space and are usually the best choice for big cats. A covered box can work if it is large enough and your cat accepts it.

How high should the entry be for a large cat?

Aim for a low front lip under about 4 inches, and keep the entry height no more than about two-thirds of your cat’s shoulder height. Lower entries are safer for older or heavier cats.

How deep should litter be in a large litter box?

Two to three inches is a good target for most large cats. Adjust based on how your cat digs and how much litter it kicks out.

Can a large cat use a top-entry litter box?

Some can, but many do not like dropping in from above. Test one carefully and watch for hesitation.

How often should I scoop a litter box for a big cat?

Scoop at least once a day. Large cats produce more waste, so a box can fill faster than expected.

What if my large cat still avoids the box?

Check for pain, especially when entering or squatting, and talk with your veterinarian. Mobility issues, urinary problems and dental pain can all cause avoidance, so a professional evaluation is important.

Conclusion

Choosing cat litter boxes for large cats comes down to measuring your cat, selecting a roomy interior, and keeping the entry low enough to step into easily. Pair the right box with sensible litter depth, a good location and a steady cleaning schedule. If your cat’s bathroom habits change suddenly, consult your veterinarian, since pain or illness is a common cause.

Ready to choose one?

Emily Parker

About Emily Parker

Emily Parker is part of our editorial team and reviews and edits our cats guides, checking product details against manufacturer specifications and owner feedback.