Open Litter Box for High Sprayers: What to Look For?

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We earn a commission from qualifying Amazon purchases made through links on this page, at no extra cost to you. Scores reflect specs and fit for sprayers, based on manufacturer listings.

⚡ Quick Verdict

📋 How We Evaluated

Each box was scored on wall height (and how much litter it takes off), interior smoothness for cleanup, footprint, entry access for older cats, and price against what you get. Dimensions come from manufacturer listings and may change, so confirm them on the product page.

Dimensions	30L x 20W x 14H inches
Entry Height	6.5 inches
Material	Smooth Plastic
Capacity	XX-Large

What We Found

At 14 inches, these are the tallest walls in this guide, and for a cat that sprays upward that’s the number that counts. The box is 30 by 20 inches, so a cat that backs up to a wall still has plenty of room behind it. The 6.5-inch entry cut keeps it climbable.

Litter eats into the wall. Put in 3 inches and you have roughly 11 inches of wall left, which is still taller than any other box here. The interior is smooth plastic, so urine wipes off in one pass, and the open top keeps air moving. What it can’t do is stop a jet that clears 14 inches. No open box in this guide can.

Who It’s For

Owners who wipe baseboards every day. Large cats and multi-cat homes with the floor space. Seniors with mild stiffness can use the 6.5-inch entry. A very stiff or arthritic cat may struggle with the 14-inch sides.

If space is tight, the 19-inch Large below gives up 2.25 inches of wall for a much smaller footprint.

Dimensions	19L x 15W x 11.75H inches
Origin	Made in USA
Style	Open Top
Wall Height	11.75 inches

What We Found

Made in the USA, with 11.75-inch walls on a 19 by 15 inch footprint. After 3 inches of litter, you’re down to under 9 inches of wall. That handles moderate sprayers and diggers far better than a flat pan, but not a cat that fires high.

The smooth surface wipes clean, and the open top lets you check urine and stool at a glance. At 19 inches long, it fits a cat up to about 12.7 inches nose to tail base under the 1.5x sizing rule.

Who It’s For

Apartment owners who need spray protection without the bulk. Single-cat homes. A secondary box in a guest room or office.

Owners who want an easy view into the box for health checks.

Quantity	2 Units Per Pack
Dimensions	19L x 15W x 11.75H inches
Origin	Made in USA
Style	Open Top Scatter Shield

What We Found

This is the same 19 by 15 by 11.75 inch box, sold as a pair. The wall height and its limits match the single box above. The value is in the pairing. In a multi-cat home, matching boxes remove one variable if your cats have preferences.

Check the per-box price against buying two singles. Don’t assume the bundle is cheaper without looking.

Who It’s For

Multi-cat homes (see our best open litter box for multiple cats) that want matching boxes in different rooms. A common guideline is one box per cat plus one extra, and a spraying cat often does better with more options.

Foster homes, and anyone replacing two worn boxes at once.

Dimensions	19L x 15W x 11.75H inches
Material	BPA-Free Recycled Plastic
Included Accessory	Scoop with Storage
Color	Grey/Beige

What We Found

BPA-free recycled plastic, 19 by 15 by 11.75 inches, in grey and beige, with a scoop that stores on the box. The front is lowered so older cats can step in while the back and sides keep their height.

The lowered front is also a lower barrier. If your cat faces the front when it sprays, expect leaks there and watch that edge. The light color shows litter dust, so it needs wiping more often than a dark box.

Who It’s For

Budget buyers who want the scoop included (more in our best budget open litter box picks). Senior cat owners who need the lowered entry. First-time owners.

Renters who want a neutral color. Also fine as a secondary box where heavy spraying isn’t a problem.

Dimensions	18L x 15.3W x 8.5H inches
Material	50% Recycled Plastic
Color	Charcoal
Back Height	High-Back Design

What We Found

This box is 18 by 15.3 by 8.5 inches, in 50% recycled charcoal plastic. The high back is where a cat that stands and sprays backward is aiming, so the extra height helps there. At 8.5 inches overall, though, it’s the lowest box in this guide, and the sides are lower than the back.

The step-in front is easy on stiff joints. Charcoal hides wear between deep cleans. The shape is simple, with no deep corners for urine to pool in.

Who It’s For

Owners who want a darker, less clinical look. Cats that dislike climbing over a high threshold. Smaller spaces.

Not for confirmed high sprayers.

Quantity	3 Shields Per Pack
Dimensions	14.5 x 11.5 inches each
Material	Transparent Plastic
Attachment	Reusable Adhesive

What We Found

A set of three clear shields, each 14.5 by 11.5 inches, attached with reusable adhesive. You stick them to a box you already own to raise the barrier where your cat sprays. The clear plastic keeps the box looking open, which matters for cats that avoid enclosed spaces.

Adhesive and urine don’t get along. Dust, litter and moisture work against the bond every day, so clean and dry the surface first and check the shields often. We can’t tell you how long the bond lasts on your box.

Who It’s For

Owners who like their current box but have one problem wall. Renters who can’t replace a provided fixture. Temporary foster or travel setups.

Anyone who wants to learn where the spray lands before buying a new box.

Is Your Cat Spraying or Just Peeing High?

The two look similar on the floor and need different fixes. A taller box handles one of them well.

Neutering lowers the chance of spraying but doesn’t remove it. Neutered males and females can spray too.

When to Call a Vet

• The change is sudden, including a cat that always used the box and now sprays.
• You see straining, crying, blood in the urine, or many trips with little output. A male cat that can’t pass urine is an emergency.
• Your cat licks its genital area a lot or seems to be in pain.
• The behavior starts around a stressful change and doesn’t settle within a few weeks.

A vet visit comes first when behavior changes. Urinary problems cause spraying-like behavior, and a new box won’t fix them.

How to Measure Spray Height and Pick the Right Wall?

1. Watch your cat during a normal visit. Note where urine lands on the wall.
2. Measure that mark from the litter surface, not the floor.
3. Add 2 inches of margin, since excited or stressed cats spray higher.
4. Add your litter depth, usually 2 to 3 inches.
5. That total is your minimum listed wall height.
6. If the total is above 14 inches, no box in this guide will do the job. See the next section.

Example: the peak mark is 8 inches above the litter. Add 2 inches for margin and 3 inches for litter, and you need a wall of at least 13 inches. The IRIS XX-Large at 14 inches clears it. A 11.75-inch box doesn’t.

Open vs Covered Litter Box for Spraying Cats

Our view: try an open high-sided box first, because a cat that refuses a hood gives you a bigger problem than wall cleanup. If the cat clears 14 inches and accepts a hood, a covered box contains it better. For the full trade-offs, read our open litter box pros and cons.

Other Ways to Cut Down on Spray Mess

• Put the box against a wall. Back the wall with a clear splash panel, or the YOILES shields.
• Keep litter at 2 to 3 inches. Deeper litter reduces your wall height.
• Set a wide litter mat for open litter boxes in front, since spray and tracked litter both land there.
• Use more than one box. A common guideline is one per cat plus one extra.
• Keep the box in a quiet spot away from noisy appliances and busy foot traffic.
• Scoop daily with a sturdy litter scoop. A dirty box can push a cat to stand on the rim or go elsewhere. For smell control between scoops, see our best open litter box for odor control guide.

How to Install Pee Shields on a Litter Box?

1. Wash the area where the shield will go with mild soap and rinse well.
2. Dry the surface completely. Adhesive won’t hold on damp plastic.
3. Hold the shield in place to check where it should sit before peeling the backing.
4. Press it on firmly and hold for several seconds.
5. Wait before using the box if the adhesive instructions say to.
6. Check the bond weekly. Re-stick or replace any shield that lifts.

Shields work best as a test. If they hold and the spray stops landing on the wall, you know a taller box is worth buying.

How to Clean Spray Off Walls and Baseboards?

1. Blot fresh urine with paper towels. Don’t rub it in.
2. Spray an enzyme-based pet urine cleaner and let it sit for the time on the label.
3. Wipe and let it dry. Repeat if the smell persists.
4. Test any cleaner on a hidden patch first, since some finishes stain.
5. Avoid ammonia-based cleaners. They smell like urine to cats and can invite repeat marking.

A spot that smells even faintly like urine can attract a cat back to it. Thorough cleaning matters as much as the box.

Which Box Fits Your Situation?

What to Look For Before Buying

Wall height is the main spec for sprayers, and it’s the one listings state least clearly. Look at the numbers, not the label. Our guide on how to choose an open litter box covers the other specs.

Measure Spray Height Accurately

Note the highest mark on the wall, measured from the litter surface. Add 2 inches for margin. Stress and excitement can push spray higher than usual. Then add your litter depth. A box under 12 inches often fails for confirmed high sprayers.

Prioritize Smooth Interior Surfaces

Seams and rough textures trap urine and odor. A smooth interior wipes clean fast. Check photos for ridges and joints. Scratched plastic can hold smell, so replace the box once scratches build up.

Balance Entry Height With Mobility

Tall sides help with spray but can stop kittens and arthritic senior cats. Look for a lowered front or a cut-out entry, like the 6.5-inch entry on the IRIS XX-Large. Watch your cat’s first few visits for hesitation.

Confirm the Footprint Fits Your Space

Measure the floor area, including room to scoop. Add a few inches for a mat. A big box in a tiny room can push a cat to avoid it. Cut a paper template and lay it on the floor first.

Frequently Asked Questions

How tall should litter box walls be for high sprayers?

Find the highest spray mark above the litter surface, then add 2 inches of margin and your litter depth. For a mark 8 inches up, with 3 inches of litter, that’s a 13-inch wall. Most boxes in this guide top out at 14 inches. If your cat sprays higher than that, a box alone won’t contain it.

Why does my cat pee over the edge of the litter box?

Common causes are a box that’s too small, walls too low, litter too deep, or a cat that stands to pee. Some cats back up to the rim and aim over it. A taller, longer box often fixes this. If it’s new behavior, see your vet.

Are open litter boxes good for cats that spray?

They work for moderate sprayers if the walls are tall enough. Cats that dislike hoods often accept them. A cat that sprays above the wall height will still leak. In that case, a hooded box contains the spray, if your cat tolerates it.

Can I modify a regular litter box for a high sprayer?

Clear adhesive shields can raise the barrier for a mild problem. Adhesive can fail with dust, litter and moisture, so check them weekly. Cutting or extending the plastic yourself can leave sharp edges. A purpose-built high-sided box is the safer long-term fix.

Do neutered cats still spray?

Yes. Neutering lowers the likelihood, especially in males, but neutered males and females can still spray. Stress, territory conflict and medical issues all play a part. A vet can help rule out a health cause.

Do high-sided boxes cause litter tracking?

Tall walls keep kicked litter inside, so they usually reduce scatter. Tracking on paws comes from the entry. A mat in front catches most of it. A box that’s too small makes cats stand near the edge and kick litter out.

How do I clean urine off a wall after my cat sprays?

Blot, then apply an enzyme-based pet urine cleaner and let it sit per the label. Wipe, dry, and repeat if there’s still a smell. Avoid ammonia-based cleaners. Test on a hidden spot first.

Do pee shields for litter boxes actually work?

They can, for mild problems on a box you already own. Their weak point is the adhesive. Clean and dry the surface before sticking them on, and expect to check them often. They’re a good test before you buy a taller box.

How often should I replace a high-sided litter box?

Replace it when deep scratches build up, the plastic turns brittle or discolored, or odor stays after a thorough wash. There’s no set date. Sunlight and heat can age plastic faster.

Is a high-sided box hard for senior cats to enter?

It can be. Arthritic cats may struggle with a 14-inch wall. Look for a lowered front or a cut-out entry, and watch how your cat steps in. The IRIS XX-Large has a 6.5-inch entry, and the Amazon Basics has a lowered front. See our best open litter box for senior cats for lower-entry options.

Related Open Litter Box Guides

• Best Open Litter Box for Large Cats: roomier boxes for big breeds
• Best Open Litter Box for Multiple Cats: setups for shared homes
• Best Open Litter Box for Odor Control: keep the smell down
• Best Open Litter Box for Senior Cats: easy-entry options
• Best Litter Mat for Open Litter Boxes: catch spray and tracked litter
• How to Choose an Open Litter Box: size, height and entry checklist

🎯 Final Verdict

Buy the IRIS USA XX-Large High Sided box if your cat’s spray reaches above 10 inches on the wall. At 14 inches it has the tallest walls here, and it’s the one box that leaves about 11 inches of wall above 3 inches of litter. It’s also 30 by 20 inches, so measure the floor first.

For a small space and a moderate sprayer, the IRIS Large at 11.75 inches is the better fit. Before you buy anything, rule out a medical cause, measure the spray mark, and use the formula above. A tall box can’t fix a problem that isn’t about height.

Want to compare every style before you buy? Browse our complete open litter box guide, or go back to the indoor cat litter box guide to see all litter box types.