Why Is My Cat Scratching the Litter Box Excessively? 6 Reasons and What to Do
Short answer: Cats scratch the litter box excessively because of instinct, litter discomfort, box size or cleanliness issues, or an underlying health concern. Identifying which reason applies to your cat makes the fix straightforward.
Is Excessive Litter Box Scratching Normal?
Some scratching is completely normal — cats are instinctively driven to bury their waste. But when the digging goes on for minutes, extends to the walls and rim, or happens without your cat actually toileting, something else is going on. The six reasons below cover the vast majority of cases.
6 Reasons Your Cat Is Scratching the Litter Box Excessively
1. Pure Instinct (and It’s Just… a Lot of It)
Burying waste is hardwired behaviour — it masks scent from predators and keeps the territory tidy. Some cats are simply more thorough about it than others. If your cat toilets normally, eats well, and seems happy, enthusiastic digging on its own is rarely a problem worth stressing over.
2. The Litter Doesn’t Feel Right Underfoot
Texture matters enormously to cats. Coarse clay granules, strongly scented litters, or dusty formulas can irritate paw pads and send cats pawing at the sides in frustration rather than the litter itself. Switching to a softer, low-dust option often resolves the behaviour within days. OI Kitty tofu cat litter is unscented, low-dust, and low-tracking — a good fit for cats with sensitive paws or noses, and a practical choice for HDB flats where dust and odour travel fast.
3. The Box Is Too Small
A cat should be able to turn a full circle and dig freely without touching the sides. Many standard boxes sold in Singapore are simply too compact for a full-grown cat. The general rule: the box should be at least 1.5× your cat’s body length. If yours is cramped, upgrade to a larger tray and see whether the frantic wall-scratching stops.
4. The Box Isn’t Clean Enough
Cats have a sense of smell roughly 14 times stronger than ours. A box that seems acceptable to you may smell overwhelmingly soiled to them. Excessive scratching — especially at the edges and corners — is often a cat trying to cover a smell it finds intolerable without stepping in waste. Scoop at least once daily, and do a full litter change regularly.
5. There Isn’t Enough Litter Depth
Most cats prefer at least 5–7 cm of litter so they can dig properly. Too shallow and they hit the tray floor immediately, which can trigger repeated, frustrated scratching as they try to complete the behaviour. Top up the box and watch whether the digging calms down.
6. A Health Issue Is Making Toileting Uncomfortable
If your cat scratches excessively and spends a long time in the box, makes repeated trips, vocalises, or produces very little urine or faeces, the scratching may signal discomfort rather than a litter preference. Urinary tract issues, constipation, and anal gland problems can all cause a cat to strain and dig. This warrants a vet visit — sooner rather than later for anything urinary-related.
This article is general information only and is not a substitute for veterinary advice. If you are concerned about your cat’s health, please consult a vet.
Quick-Reference: Cause vs. Fix
| What You See | Likely Cause | What to Do |
|---|---|---|
| Long digging, normal toileting, happy cat | Instinct / personality | Nothing — this is fine |
| Scratching walls and rim, avoiding litter | Litter texture or scent | Switch to unscented, low-dust litter |
| Scratching sides, body touching the walls | Box too small | Upgrade to a larger tray |
| Scratching corners and edges only | Box not clean enough | Scoop daily; change litter more frequently |
| Hitting the tray floor immediately | Litter too shallow | Add more litter (aim for 5–7 cm) |
| Repeated trips, straining, vocalising | Possible health issue | See a vet promptly |
When Should I Call the Vet?
Book an appointment if you notice any of the following alongside the excessive scratching:
- Frequent trips to the box with little or no output
- Blood in urine or faeces
- Crying or vocalising while in the box
- Lethargy, reduced appetite, or hiding
- Licking the genital area repeatedly after toileting
Urinary blockages in particular can become life-threatening within hours in male cats. When in doubt, call your vet.
Simple Habits That Help Long-Term
- One box per cat, plus one extra — the standard multi-cat rule, and a good idea even for single-cat homes.
- Consistent litter brand — cats dislike surprise changes. If you switch, blend old and new litter over a week.
- Quiet, accessible location — avoid placing the box near loud appliances or high foot-traffic areas.
- Adequate hydration — cats who drink well are less prone to urinary issues that can drive litter box distress. Many cats in Singapore barely touch their water bowl; mixing a splash of pet-safe liquid into their routine is an easy nudge in the right direction.
Frequently Asked Questions
Why does my cat scratch the litter box walls and not the litter?
Wall-scratching usually means the litter itself is the problem — it may be too coarse, too scented, or too dusty for your cat’s liking. Try switching to an unscented, low-dust litter with a finer texture. A box that is too small can also push a cat to scratch the sides instead of digging properly.
Is it normal for cats to scratch the litter box for a long time?
Occasional long digging sessions are normal — it is instinctive behaviour. It becomes a concern when the scratching happens without toileting, is accompanied by straining or vocalising, or involves repeated trips to the box. In those cases, a vet check is worthwhile.
How do I stop my cat from scratching litter everywhere?
Use a box with higher sides or a partial hood to contain the spray. Low-tracking litter also helps — tofu-based litters, for example, tend to clump well and stick to paws less than clay. Placing a mat outside the box entrance catches anything that does escape.
Could my cat be scratching the litter box because of stress?
Yes. Stress and anxiety can cause cats to over-groom, over-eat, or over-dig in the litter box. Common triggers in Singapore homes include a new pet, a move, renovation noise, or changes in the household routine. If you suspect stress, look for other signs like hiding, changes in appetite, or increased vocalisation, and speak to your vet about behavioural support.
How often should I change cat litter to keep my cat comfortable?
Scoop solids and clumps at least once a day. Do a full litter change — wash the box, dry it thoroughly, and add fresh litter — roughly every one to two weeks depending on your cat’s usage and the litter type. A clean box is one of the easiest ways to prevent litter box aversion and the scratching behaviours that come with it.
Written by the Chewbarka team, Singapore pet parents.
