Why Does My Cat Smell Bad From the Skin? Causes & Solutions

A bad smell coming from your cat’s skin is never something to ignore. Cats are meticulous self-groomers, so when an odour persists despite grooming, it almost always points to an underlying skin or health condition. Here’s what causes feline body odour specifically — which differs significantly from the same issue in dogs.

Why Cats Normally Don’t Smell

Healthy cats are naturally low-odour animals. Unlike dogs, they don’t have apocrine sweat glands distributed across their bodies (cats only sweat through their paw pads) and they spend hours each day grooming. A cat that starts to smell unpleasant has almost certainly developed a medical condition, as the odour overpowers their grooming efforts.

Common Causes of Bad Skin Odour in Cats

1. Seborrhoea

Seborrhoea causes the skin to overproduce oil (sebum), leading to a greasy, waxy coat with an unpleasant musty or rancid odour. In cats, it often presents as greasy fur along the back and tail area. Obese cats and those with diabetes or hyperthyroidism are particularly prone, as they struggle to groom their lower back and base of tail properly.

2. Skin Fold Dermatitis

Flat-faced (brachycephalic) breeds — Persians, Exotic Shorthairs, and Himalayans — are prone to skin fold dermatitis. Moisture and bacteria accumulate in the folds around the nose, face, and tail, producing a distinct sour or cheesy smell. Regular cleaning of skin folds is essential for these breeds.

3. Bacterial Skin Infection (Pyoderma)

While pyoderma is very common in dogs, it’s actually rare as a primary condition in cats. When it does occur, it usually develops secondary to another problem — allergies, ringworm, or immune suppression. Infected skin has a distinctive sweet, yeasty, or pungent smell. You’ll typically also see redness, crusting, or pustules.

4. Yeast Infection (Malassezia)

Yeast overgrowth on feline skin produces a characteristic stale, musty or “corn chip” odour. In cats, Malassezia infections often affect the ear canals (causing dark, waxy discharge and intense itching) and occasionally the skin folds or chin. They’re less common on general body skin than in dogs.

5. Anal Gland Problems

Although technically not skin, impacted or infected anal glands produce a powerful fishy or metallic smell that owners often attribute to the skin near the tail. Cats can express their anal glands when frightened or stressed, causing a sudden pungent odour. Anal gland disease is less common in cats than dogs but does occur, particularly in overweight cats.

6. Hyperthyroidism and Diabetes

Metabolic conditions unique to cats — especially hyperthyroidism (very common in cats over 10 years) and diabetes — can alter the smell of the coat. A sweet, fruity breath and coat odour in an older cat may indicate uncontrolled diabetes. A general greasy, unkempt coat odour in a senior cat often accompanies hyperthyroidism.

When to See a Vet

Book a vet appointment if the smell is persistent, worsening, or accompanied by changes in grooming behaviour, appetite, weight, or coat quality. In senior cats especially, a new or changed body odour is often the first sign of an internal health change that needs investigation.