Most cats use the litter box and leave. Some hang around. A smaller subset does something that stops many owners in their tracks: they lick the inside of the box, sometimes before they've even finished using it. It's odd enough that it gets described in cat groups constantly. So what's actually going on?
It's Usually a Sign of Nutritional Need
The most common explanation is mineral deficiency. If a cat's diet is low in sodium, calcium, or certain trace minerals, they may seek out unusual sources — including the mineral content in certain litter types. Clay-based litters, in particular, contain trace minerals that can taste appealing to a deficient cat. Bentonite clay contains aluminium silicates, calcium compounds, and sodium — all of which a cat with a genuine deficit might actively seek.
The solution is straightforward: review your cat's diet with your vet, and consider whether they're getting complete nutrition from their current food. Check price on Chewy → A vet can run a simple blood panel to rule out deficiencies.
Stress and Anxiety Can Trigger the Behaviour
Some cats lick the litter box as a self-soothing behaviour. The action is repetitive and calming — similar to how some humans bite their nails. If your household has changed recently — a new pet, a move, construction, even a new piece of furniture — your cat may be managing elevated stress by engaging in this displacement behaviour.
Stress-related licking tends to be more persistent and harder to interrupt than hunger-driven licking. If it started around a known change, that's a strong clue.
Territory and Scent-Marking
A cat's mouth carries their individual scent signature. Licking a shared or communal surface deposits that scent, which serves as a territorial signal — both to other cats in the household and to themselves. For multi-cat households, this is particularly common. One cat may lick the box after another cat has used it, essentially reclaiming it.
This is generally harmless unless it escalates or is accompanied by other stress signals like hiding, spraying, or aggression between cats.
Medical Causes to Rule Out
Before assuming behavioural cause, rule out the medical ones. Pica — the urge to eat non-food items — can be associated with underlying conditions including anemia, hyperthyroidism, and certain gastrointestinal issues. Cats with diabetes may also show unusual licking behaviours due to increased thirst and urinary output changes affecting their scent environment.
If your cat licks the box frequently and consistently, a vet check is a sensible first step.
Litter Type Matters
Some litter types are more likely to attract licking behaviour. Clumping clay litters with high mineral content tend to be the most commonly licked. Pine litters and paper-based litters have very different textures and tastes — if your cat is licking clay, switching to a plant-based litter may reduce the behaviour simply because the material isn't appealing to lick.
You can View on Amazon → for a wider selection of plant-based litter options that tend to be less attractive for licking.
When to Act
Occasional licking isn't a concern. Consistent, daily licking — especially if it's focused on consuming litter rather than just licking the surface — is worth investigating. Ingesting large amounts of any litter, including clay, can cause intestinal blockages, particularly with clumping types that expand on contact with moisture.
If your cat is eating litter rather than just licking it, treat it as a vet visit situation. The behaviour is telling you something, and it's usually worth listening to.
The Bottom Line
A cat licking the litter box occasionally is rarely an emergency. Consistent licking that involves ingestion, however, needs investigation — start with a vet check for nutritional deficiencies and underlying medical conditions, then address stress or litter type if the behaviour continues. Check price on Chewy → Getting to the root cause is better than just managing the symptom.