Why Does My Cat Scratch the Sides of the Litter Box?

The sound of a cat repeatedly scraping the plastic sides of a litter box can make an ordinary bathroom routine seem strange or concerning. Sometimes the cat scratches before eliminating. Sometimes they scrape afterward as though they are trying to cover their waste, even though their paw barely touches the litter.

Quick Answer

Scratching the sides of a litter box is often part of a cat’s wider digging, preparation, or covering sequence. The wall, hood, entrance frame, or floor of the box has simply become the surface their paw contacts. Some cats regularly perform this motion while moving very little litter or leaving their waste uncovered.

When the behavior is brief, familiar, and relaxed—and the cat enters, eliminates, and leaves normally with normal-looking urine or stool—it may be that cat’s established routine. It does not, by itself, prove that the cat is stressed, dominant, territorial, spiteful, cleaning their paws, rejecting the litter, or experiencing a medical problem.

However, the behavior can also provide a reason to inspect the setup. A cramped interior, restrictive hood, awkward entrance, snagging liner, damaged component, unsuitable litter surface, poor cleanliness, unsafe location, or pressure from another animal may affect how comfortably a cat can use the box.

The best approach is to watch the complete sequence, check for a specific problem, and change only one relevant variable at a time. Sudden or markedly increased scratching—especially with straining, crying, repeated visits, abnormal output, accidents, pain, weakness, or other behavior changes—requires veterinary advice. Repeated attempts to urinate with little or no urine require urgent veterinary care.

What Side Scratching Can—and Cannot—Tell You

Cats commonly interact with the litter before and after eliminating. A typical sequence may include investigating the area, digging, adopting an elimination posture, producing urine or stool, and making covering movements afterward. Our guide to why cats bury their poop explains the broader digging and covering behavior.

A cat does not necessarily direct every paw movement into the litter. Depending on their position and the box’s shape, a paw may land on the side, back wall, entrance frame, hood, or exposed floor. The resulting scraping can look deliberate and ineffective, but the movement alone does not reveal exactly what the cat intends.

Research specifically addressing side-wall scratching is limited. In a 2025 study involving cats with existing elimination problems, side, floor, and wall scratching decreased when the cats were offered a bundled setup involving a larger litter box and clumping clay litter. This supports treating the behavior as a possible setup clue, but it does not prove that every cat who scratches a wall is dissatisfied. The study involved selected cats, changed more than one variable at once, relied partly on owner observations, and included an author employed by a manufacturer involved in the research.

A separate observational study found more pawing at surfaces other than litter in cats housed in a more restrictive clinic-like environment. That finding also supports examining the complete environment and behavioral sequence, but it cannot diagnose the reason an individual household cat scratches a particular box.

Side scratching therefore belongs in context. It is one observation—not a verdict on the cat, the litter, or the box.

It Does Not Prove Dominance or Territorial Intent

The idea that every unusual litter-box behavior is a display of dominance or territory is too simple. Cats may use scent in several forms of communication, but a paw scraping the inside of a litter box does not, by itself, demonstrate a territorial message.

Likewise, cats do not perform an awkward-looking covering motion to be spiteful, stubborn, or deliberately messy. Those labels do not explain whether the cat can move comfortably, accepts the litter, is experiencing social pressure, or has developed a health problem.

It Does Not Prove the Cat Is Cleaning Their Paws

A cat may shake a paw or groom after using the litter box, particularly if particles cling to the fur or pads. Scraping the side of the box might sometimes dislodge material, but the motion alone is not enough to conclude that paw cleaning is the cat’s purpose.

The useful questions are what happens immediately before and after the scraping, whether litter is stuck to the paws, and whether the cat appears comfortable.

It Does Not Automatically Mean the Box Is Dirty

Cats generally benefit from clean toileting areas, but wall scratching is not a cleanliness test. A cat may scrape a freshly cleaned box, while another cat may respond to an unacceptable box by hesitating, leaving quickly, perching at the edge, or eliminating elsewhere.

If cleanliness may be contributing, review how often to clean a cat litter box rather than assuming that extra cleaning will necessarily stop the scratching.

Watch the Complete Litter-Box Sequence

The timing of the behavior can help identify what to inspect, although it still cannot reveal one certain motivation.

Scratching Before Elimination

Scratching before urination or defecation may occur while the cat investigates the surface, distributes the litter, or prepares a place to eliminate. A paw may reach the wall because of the cat’s chosen position, an established movement pattern, or limited room inside the box.

Watch whether the cat can:

Enter without squeezing or catching a paw
Stand with all four paws supported
Turn without pressing against the walls
Balance and adopt a normal elimination posture
Reach and dig in the litter
Leave without backing out awkwardly or rushing

Scratching before one normal elimination is different from repeatedly entering, scratching, repositioning, and leaving without producing normal urine or stool. In the second pattern, possible elimination difficulty matters more than the surface being scratched.

Scratching After Elimination

Scratching afterward may be part of the cat’s covering sequence. Some cats move litter directly over their urine or stool. Others make repeated covering-like movements against a wall, hood, floor, or nearby edge while moving little litter.

The result may look ineffective without being a complete refusal or inability to cover. If the main concern is that poop remains exposed, why some cats do not cover their poop addresses that separate decision in detail.

Pay attention to whether the cat remains relaxed, finishes the routine, and leaves normally. Prolonged, escalating, interrupted, or frantic behavior deserves more attention than a familiar sequence that has always ended calmly.

Side Scratching Is Not the Same as Kicking or Tracking Litter

A cat scraping the wall may create noise without throwing much litter. Forcefully digging or kicking particles over the rim is a different problem, covered in why cats kick litter everywhere.

Litter found farther from the box may instead have adhered to the paws or coat. In that case, use the guide to reducing litter tracking around the house.

When Side Scratching May Be an Established Routine

A long-standing side-scratching habit may be reasonable to monitor when all of the following remain true:

The cat enters the box voluntarily and reliably
The behavior appears calm and familiar
The cat can turn, balance, dig, eliminate, and leave without obvious obstruction
Urine and stool remain normal for that cat
There is no crying, straining, repeated unsuccessful effort, or apparent pain
The cat is not suddenly spending much longer in the box
The box is clean, stable, intact, and large enough for comfortable use
No claw is catching on a liner, ridge, crack, or damaged edge
The cat is not chewing or swallowing plastic
There are no new accidents or wider changes in appetite, mobility, activity, or behavior

There is no universal safe number of scratches or duration. A cat’s established pattern and the surrounding behavior are more informative than counting individual paw movements.

If the setup is safe and accepted, do not replace it merely because the motion looks odd or fails to move much litter. Stopping the scratching is not the only measure of a successful litter-box setup.

When the Setup Deserves Inspection

Side scratching cannot identify one setup problem, but it can prompt a focused inspection.

Check the Usable Interior Space

The external measurements advertised for a litter box may overstate the space the cat can actually use. Sloped walls, rounded corners, entrance frames, internal ridges, and hoods can reduce the standing and turning area.

Look at the cat inside the assembled box rather than judging it from the label. Constant wall contact, awkward turning, a compressed posture, an inability to dig in more than one area, or difficulty entering and leaving may indicate that the usable interior is restrictive.

For a detailed assessment, see what size litter box a cat needs.

A larger box may help some cats, but side scratching alone does not prove that size is the problem, and no single dimension suits every cat or home.

Consider the Hood Without Assuming It Must Go

A covered box changes the cat’s headroom, visibility, airflow, turning space, and main entrance and exit. A cat scraping the hood or repeatedly contacting the sides may benefit from an inspection of the assembled interior.

That does not mean every covered box is uncomfortable. Some cats reliably accept a roomy covered box and show no difficulty using it. Others prefer an uncovered option. Research comparing covered and uncovered boxes found no universal population-level preference, although some individual cats showed a clear preference.

Use the cat’s voluntary behavior and actual movement inside the box. The complete covered-versus-uncovered litter box comparison can help if the cover itself appears relevant.

Inspect Liners and Damaged Components

A loose liner can bunch beneath the paws, tear, or catch a claw. Cracked plastic, rough damaged edges, a displaced entrance frame, or an unstable hood can also interfere with footing.

If a claw catches or a component is damaged, treat that as a physical-safety concern rather than waiting to see whether the scratching stops. Use an intact, stable setup designed to function as assembled, and follow the manufacturer’s replacement or removal instructions where applicable.

Do not tape, glue, cut, drill, sand, coat, or otherwise improvise a repair inside the box. Do not add sticky, abrasive, scented, or unstable materials to discourage contact.

Look at the Litter Surface

Texture, depth, distribution, contamination, and compaction can affect how a cat digs and balances. A cat may also reach a bare area or wall after litter has shifted to one end of the box.

These are possible influences, not conclusions that can be drawn from scratching alone. Avoid assuming that the litter is automatically too deep, too shallow, or the wrong material.

If the litter itself appears relevant, use the separate guides to choosing a cat litter and deciding how deep the litter should be.

Notice Location and Social Pressure

A cat may use a box hurriedly or remain guarded if the location is noisy, an exit is blocked, a dog or child approaches, or another cat can ambush them. Look for scanning, freezing, repeated interruptions, rapid exits, reluctance to enter, or another animal waiting nearby.

Side scratching does not diagnose fear or intercat tension. If the surrounding location appears to be the concern, review where to put a cat’s litter box rather than trying to suppress the scratching itself.

How to Test One Relevant Change

Observe before changing anything. Note:

Whether scratching occurs before elimination, afterward, or at both times
Which surface the cat contacts
Whether normal urine or stool is produced
Whether the cat appears balanced and relaxed
Whether the behavior is established, new, or increasing
Whether a liner, entrance, hood, ridge, or damaged part obstructs the paw
Whether another animal or household activity interrupts the sequence

If that observation identifies one plausible setup concern, test one relevant variable where practical. For example, offer a roomier box if movement appears restricted, or an uncovered alternative if the hood appears to obstruct the cat. Preserve the accepted option while offering the alternative when it remains safe to do so.

For a possible litter preference, compare one appropriate alternative without simultaneously moving the box, changing its design, altering the depth, and introducing a new cleaning routine. Multiple changes may disrupt an accepted routine and make it impossible to tell which difference influenced the cat.

Allow the cat to investigate and choose voluntarily. Do not carry, place, lure, or confine the cat inside a box to demonstrate the new setup. Do not remove the only reliably accepted toileting option solely because side scratching continues.

There is no universal observation period. Judge the test by repeated voluntary use, comfortable movement, normal elimination, and the absence of concerning signs—not by whether every scraping motion disappears.

What Not to Do

Do not try to stop side scratching by making the litter box unpleasant. In particular:

Do not shout, clap, spray, touch, startle, or physically interrupt the cat
Do not punish the cat before, during, or after toileting
Do not force or confine the cat inside the box
Do not apply strong scents or deterrent sprays
Do not add sticky tape, foil, abrasive coverings, unstable objects, or rough textures
Do not make improvised structural modifications
Do not repeatedly replace a safe, accepted setup in pursuit of a perfectly efficient covering motion

Punishment and forced exposure can make the litter-box area less predictable or safe. They also risk suppressing visible behavior without addressing pain, obstruction, litter preference, or environmental pressure.

When to Contact a Veterinarian

A familiar motion becomes more concerning when it changes suddenly or appears alongside altered elimination or general behavior.

Contact a veterinarian if side scratching is new, markedly increased, prolonged, frantic, or accompanied by:

Crying or apparent pain
Straining to urinate or defecate
Frequent or repeated box visits
Unusually small amounts of urine
Blood in urine or stool
Very hard stool, constipation, or diarrhea
Urine or stool outside the box
Vomiting
Reduced appetite
Hiding, lethargy, or marked behavior change
Weakness, stiffness, poor balance, or difficulty entering and leaving
Repeated entry and scratching without normal urine or stool

If urine is appearing elsewhere, follow the broader pathway for a cat peeing outside the litter box. If stool is appearing elsewhere, use the guide to a cat pooping outside the litter box.

Older cats may need their complete route, entry, posture, footing, and exit reviewed. The guide to setting up a litter box for a senior cat covers that wider accessibility decision.

Repeated attempts to urinate with little or no urine require urgent veterinary care. A urinary obstruction can become life-threatening, and further litter-box experimentation must not delay assessment.

Scratching plastic is also different from chewing, breaking, or swallowing it. Plastic can act as a gastrointestinal foreign body. If the cat may have swallowed plastic, or develops vomiting, appetite loss, lethargy, abdominal discomfort, or difficulty passing stool, contact a veterinarian promptly.

A litter-box adjustment cannot diagnose or treat urinary disease, constipation, diarrhea, pain, weakness, sensory change, compulsive behavior, or another medical condition.

A Practical Decision Rule

Monitor the behavior when it is familiar, calm, and accompanied by comfortable box use and normal output.

Inspect the setup when the cat appears cramped, obstructed, interrupted, or unable to interact comfortably with the litter.

Test one relevant adjustment when observation identifies a plausible environmental factor, while preserving safe accepted options.

Seek veterinary advice when the behavior is new or escalating or when elimination, output, posture, mobility, appetite, or general behavior changes. Treat repeated attempts to urinate with little or no urine as urgent.