Pica in Cats: Why Some Cats Eat Wool, Plastic, and Other Things That Aren't Food

Plenty of cats bat a shoelace around or gnaw the corner of a cardboard box now and then. But some cats go further: they suck and chew on wool blankets until there are holes in them, swallow strips of plastic bag, eat cat litter, chew through phone chargers, or gulp down hair ties and lengths of string. This compulsive eating of things that are not food has a name — pica — and while a lot of it looks like a quirky habit, it can occasionally turn into a surgical emergency. Understanding why cats do it is the first step to protecting them, because the goal is not to shame the behaviour but to figure out what is driving it and to make your home a lot harder to eat.

What Counts as Pica — and What Doesn't

The key word is ingestion. A cat that chews the edge of a box, shreds a paper bag, or wrestles a hair tie across the floor is playing and exploring with its mouth — normal, and mostly harmless as long as it is supervised. Pica is when the cat actually eats and swallows the material. The most commonly targeted items include:

• Wool and fabric — blankets, jumpers, sofa throws; "wool-sucking" is the classic form and often starts with sucking and kneading before progressing to chewing and swallowing.
• Plastic — shopping bags, cling film, plastic packaging (the crinkle and the faint smell of food are part of the appeal).
• String-like items — thread, yarn, ribbon, dental floss, hair ties, elastic bands and tinsel. These are the most dangerous of all.
• Cardboard, paper and rubber, and sometimes cat litter, soil, or houseplants.

An occasional nibble is worth watching. A cat that routinely seeks out and swallows non-food material is showing pica, and it deserves a proper look at the cause.

Why Do Cats Develop Pica?

There is rarely a single answer. Pica sits at the crossroads of behaviour, genetics and medicine, and the sensible approach is to rule out the medical causes first, then address the behavioural ones.

Early weaning and the wool-sucking link. Kittens taken from their mother too young often carry the suckling reflex forward, latching onto soft fabric. In some cats this comforting habit hardens over time into genuine chewing and swallowing.

Genetics and breed. Pica — especially wool-sucking — is noticeably more common in the Oriental breeds: Siamese, Burmese and Tonkinese in particular. That pattern strongly suggests an inherited component in at least some cats.

Boredom, stress and anxiety. An under-stimulated indoor cat, or one stressed by change, conflict with another cat, or a lack of routine, may turn to chewing as an outlet — a self-soothing behaviour not unlike stress-eating. Pica frequently travels alongside other signs of anxiety.

Medical causes. This is why a vet visit matters. Conditions that can drive a cat to eat strange things include anaemia, gastrointestinal disease, hyperthyroidism, diabetes, and dietary problems such as insufficient fibre. The popular idea that pica is simply a "nutritional deficiency" the cat is trying to correct is mostly a myth — most cats on complete commercial diets are not deficient in anything — but because real medical problems can cause it, a check-up should always come first.

Cat behaviourist Jackson Galaxy works with owners whose cats compulsively eat things they shouldn't — a real look at how pica is managed.

The Real Danger: Blockages and "Linear Foreign Bodies"

Here is the part every owner of a chewing cat needs to understand. The biggest risk of pica is not the odd bit of digested cardboard — it is a gastrointestinal obstruction. Swallowed plastic, wads of fabric or rubber can lodge in the stomach or intestines and block them. And string-type items are a category of their own: vets call them linear foreign bodies, and they are uniquely dangerous.

When a cat swallows thread, ribbon or a hair tie, one end can snag — often caught under the tongue or at the stomach outlet — while the intestines keep trying to push the rest through. The gut bunches up along the string like fabric gathered on a drawstring, and the taut thread can literally saw through the intestinal wall. This causes leakage into the abdomen, severe infection, and it is frequently fatal without emergency surgery. Never pull on a string you find hanging from your cat's mouth or bottom — you can cause catastrophic internal damage. Leave it, and get to a vet immediately.

Warning signs of a blockage include repeated vomiting, refusing food, lethargy, a painful or bloated belly, straining, and constipation or diarrhoea. Any of these in a cat known to chew non-food items is an emergency until proven otherwise.

A sobering real case: a cat whose pica led to repeated intestinal blockages and emergency trips to the vet — exactly why this behaviour is never just a quirk.

What to Do About It

Managing pica works best on two fronts at once: rule out illness, and change the environment so eating the wrong things becomes both harder and less tempting.

• See the vet first. Ask for a check that covers the medical causes above. Treating an underlying problem such as hyperthyroidism or GI disease can resolve the pica on its own.
• Cat-proof relentlessly. This is the single most effective safety step. Put wool, yarn, sewing kits, hair ties, rubber bands, cling film and plastic bags out of reach in closed drawers and bins. Tidy away charger cables. Treat string like you would treat a bottle of pills.
• Fight boredom. Add daily interactive play with wand toys, food puzzles that make the cat work for meals, window perches, and vertical space. A busy, well-exercised cat has less need to chew for stimulation.
• Offer safe alternatives. Provide cat grass or vet-approved chew toys so the urge to gnaw has a legal outlet. Some cats do better with a bit more dietary fibre — ask your vet before changing the diet.
• Lower the stress. Keep routines predictable, make sure there are enough resources (litter trays, feeding stations, resting spots) for every cat in the home, and consider a synthetic pheromone diffuser. If anxiety is severe, your vet or a behaviourist can help with a proper plan.
• Make targets unappealing. Bitter anti-chew sprays on favoured items, or covering them, can deter a determined chewer while you work on the bigger picture.

When It's an Emergency

Call your vet straight away — or an out-of-hours clinic — if you know or suspect your cat has swallowed string, a hair tie, or a chunk of plastic or fabric, or if you see a thread hanging from either end of your cat. Do not wait, and do not pull. Likewise, treat repeated vomiting, a refusal to eat, a tense or swollen abdomen, or sudden lethargy as an emergency in any cat with a history of eating non-food items. When it comes to blockages, hours matter.

The Bottom Line

Pica ranges from a mildly destructive habit to a genuinely dangerous one, and the same cat can drift from one to the other. Most cases are manageable once you have ruled out illness and made the house harder to eat — more play, safe chew alternatives, less stress, and a ruthless approach to keeping string and plastic locked away. Take the behaviour seriously, especially in the wool-loving Oriental breeds, and never underestimate a swallowed thread. A little cat-proofing today is far cheaper, and far kinder, than emergency surgery tomorrow.

This article is general information, not veterinary advice. If your cat is chewing or eating non-food items, have it assessed by your vet — and any cat that may have swallowed string or shows vomiting, belly pain, or a refusal to eat should be treated as a possible emergency.