---
title: "Cat Not Using the Litter Box?"
description: "Why has my cat stopped using the litter box? Medical causes, stress, litter preferences, and step-by-step fixes. See when to call your vet."
url: "https://pethealth.org.uk/health/cat-litter-box-problems"
canonical: "https://pethealth.org.uk/health/cat-litter-box-problems"
date_published: "2026-06-23"
date_modified: "2026-06-23"
source: "PETHEALTH+"
---

# Cat Not Using the Litter Box?

When a cat stops using the litter box, **rule out illness first** — urinary tract infections, bladder stones, and cystitis are common and painful. If a male cat is straining without producing urine, treat it as an **emergency**. Once health is cleared, look at tray hygiene, location, litter type, and stress from changes at home or other cats.

## Medical causes (check these first)

Litter box avoidance is often a **symptom**, not bad behaviour. See your vet promptly for:

- **Feline lower urinary tract disease (FLUTD)** — frequent attempts, blood in urine, crying in the tray
- **Urinary blockage** — especially in **male cats**; cannot pass urine, painful abdomen, vomiting (emergency)
- **Kidney disease, diabetes, or hyperthyroidism** — increased urination and accidents
- **Arthritis** — difficulty stepping into a high-sided tray

Never assume the problem is behavioural until a vet has ruled out pain and illness.

## Behavioural and environmental causes

**Dirty trays** — Scoop at least daily; fully change clumping litter regularly. Cats have a keen sense of smell.

**Wrong location** — Trays should be quiet, away from noisy appliances and dog feeding areas, with escape routes (not trapped in corners).

**Litter preference** — Many cats prefer unscented, fine-grained clumping litter. Sudden brand changes can trigger avoidance.

**Too few trays** — In multi-cat homes, provide **one tray per cat plus one extra**, in separate locations.

**Stress** — New pets, babies, building work, or neighbourhood cats visible through windows can cause marking or avoidance. Feliway-style diffusers and predictable routines help some cats.

**Previous bad association** — If a cat was startled or in pain while in the tray, they may avoid that box or room.

## Step-by-step fixes

1. **Vet examination and urinalysis** before retraining
2. Add trays in new, calm locations
3. Try unscented clumping litter; shallow entry if the cat is older
4. Clean soiled areas with enzymatic cleaner (not ammonia-based products)
5. Reduce conflict between cats with separate resources
6. Increase play and vertical space (cat trees, shelves)

## Spraying vs toileting

**Spraying** — Small amounts on vertical surfaces (walls, furniture legs), usually standing with tail quivering. Often territorial, especially in intact males; neutering reduces it. Stress-related marking needs environmental management.

**Toileting outside the box** — Larger puddles on horizontal surfaces; usually tray aversion or urgency from illness.

## FAQs

### Why is my cat peeing outside the litter box?

Common causes include urinary tract disease, stress, dirty or poorly placed trays, dislike of litter type, and multi-cat conflict. A vet check should come first to rule out pain.

### How many litter boxes does a cat need?

The usual rule is one tray per cat plus one extra in multi-cat homes, placed in quiet, accessible locations.

### Will punishing my cat stop litter box problems?

No — punishment increases stress and makes avoidance worse. Focus on medical care and environmental fixes.

### Is straining in the litter box an emergency?

Yes for male cats — inability to pass urine can be fatal within hours. Seek emergency veterinary care immediately.

## Sources

- [International Cat Care — House soiling](https://icatcare.org/advice/house-soiling/)
- [ISFM — Feline environmental needs](https://icatcare.org/advice/what-is-the-ideal-home-for-a-cat/)

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Last modified: 2026-06-23