Can cats eat Leeks?
No. Leeks are toxic to cats and common in UK cooking — leek and potato soup, casseroles, and winter stews all contain enough leek to cause harm.
If your cat has just eaten leeks
- Move your cat away from any remaining leek. Do not try to make them vomit at home — this is dangerous in cats and rarely works.
- Note how much was eaten and when, and keep the packaging or a photo of the plant/substance if you can.
- Call your vet immediately, even out of hours. Tell them your cat's weight, what they ate, and when.
- If you can't reach your vet, call Animal PoisonLine (01202 509000) — paid triage, 24/7 for guidance. They can advise on urgency and route you to emergency care.
What's the full picture?
Leeks sit in the same toxic allium family as onions and garlic. They cause the same oxidative damage to feline red blood cells, leading to haemolytic anaemia. Leeks are often underestimated because they're less pungent than onions, but they contain the same toxic principles.
In UK cooking, leeks feature heavily in winter soups, stews, pies, and casseroles. Leek and potato soup, cock-a-leekie, and chicken and leek pie are all dangerous for cats if they steal leftovers or lick dishes.
Cooked, sautéed, or braised — preparation doesn't reduce the toxicity. Freezing leeks before cooking also has no effect on the toxic compounds.
Symptoms to watch for
Hidden sources you might not think of
- Leek and potato soup
- Chicken and leek pie, cock-a-leekie soup
- Casseroles and winter stews
- Quiche and savoury tarts
- Vegetable stock and ready-made soups
Safer alternatives
- Plain cooked chicken
- Plain cooked white fish with no seasoning
Questions owners ask
My cat ate some leek and potato soup. What should I do?
Call your vet immediately. Even a small bowl contains enough leek to cause measurable red blood cell damage in an average-sized cat. Note the volume eaten and the time.
Is leek the same toxicity as onion?
Yes — leeks, onions, garlic, and chives all contain the same toxic compounds and cause the same condition. Leeks are sometimes perceived as gentler because the flavour is milder, but the toxicity is comparable per gram.
Related
About this guidance
Every entry on this site is compiled from published UK veterinary toxicology sources — International Cat Care, Veterinary Poisons Information Service (VPIS) references, RCVS-registered practice materials, and peer-reviewed feline medicine literature. Where the evidence is mixed, we err on the cautious side because cats are unusually sensitive to many common substances that are harmless to humans and even to dogs.
This is general information written for UK cat owners. It is not personalised veterinary advice for your specific cat, their age, weight, medical history, or the exact exposure you're dealing with. If your cat has eaten something or is unwell, call your vet first. The Animal PoisonLine on 01202 509000 is available 24/7 for a small fee and can tell you whether an emergency visit is needed.
Entries are reviewed and updated as new research emerges. Spotted an error? Let us know — corrections are investigated and applied within 24 hours. For more context on how we work, see about and our full disclaimer.
Last reviewed: · By the What Can My Cat Eat? editorial team