No. Leeks are part of the onion and garlic family, and they are toxic to cats. Cooking does not make them safe, and they can damage a cat's red blood cells and lead to anemia. Keep leeks and dishes made with them away from your cat.
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Danger — a stronger Allium than it looksTreat it as a poisoning risk
Can cats eat leeks? 🧅
No. Leeks are part of the onion and garlic family, and they are toxic to cats. Cooking does not make them safe, and they can damage a cat's red blood cells and lead to anemia. Keep leeks and dishes made with them away from your cat.
Source-linked record · Last reviewed July 17, 2026 · Not veterinary advice
Why this answer
Leeks carry the same organosulfur oxidants as other Allium vegetables, and they are considered relatively potent within the group. Once eaten, these compounds attack a cat's red blood cells and cause Heinz-body anemia. Heat does not neutralize them, so cooked leeks in soups and stews remain hazardous.
Watch for
Pale or whitish gums
Tiredness and weakness
Faster breathing or pulse
Dark or blood-tinged urine
Loss of appetite and vomiting
How much is okay
None — do not feed leeks in any form, and keep leek-based soups and quiches out of reach.
Keep it away
Keep raw and cooked leeks off plates and cutting boards a cat can reach.
Do not share soups, stocks, or casseroles that contain leeks.
Compost leek trimmings in a bin the cat cannot open.
Sources and evidence notes (3)
Allium spp Toxicosis in Animals
Merck Veterinary Manual — Onion, garlic, leek, and chive toxicosis: organosulfur oxidants cause Heinz-body hemolytic anemia; cats are notably more sensitive than dogs; raw, cooked, and powdered forms are all hazardous.
People Foods to Avoid Feeding Your Pets
ASPCA Animal Poison Control Center — Multi-species veterinary toxicology list covering alcohol, chocolate, caffeine, citrus, coconut, grapes and raisins, macadamia nuts, milk and dairy, nuts, onions, garlic and chives, raw meat and eggs, salty snacks, xylitol, and yeast dough.
Poisons
Cornell Feline Health Center, Cornell University College of Veterinary Medicine — Feline-specific poisoning overview covering common household toxin exposures in cats, clinical signs, and the need for prompt veterinary care.
Answer card
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Remove access. Take the food away and move your cat to another room.
Note the facts. What was it, roughly how much is missing, and when? Keep the packaging.
Call before symptoms. For chocolate, onion, garlic, grapes, raisins, alcohol, or anything sugar-free (xylitol), call a hotline or your veterinarian now — early treatment is easier and cheaper.
Never do this
Do not induce vomiting, feed milk, salt, or oil, or wait overnight to "see how it goes". Signs of chocolate or Allium poisoning can take hours to days to appear.
Go to an emergency vet immediately if
Your cat is collapsing, twitching or seizing, struggling to breathe, drooling heavily, vomiting repeatedly, or wobbly on their feet.
Outside the US? Call your local emergency veterinary clinic — keep the number saved in your phone.
Effective: July 17, 2026
Can Cats Eat It? provides general educational information for cat owners. It is not veterinary, diagnostic, treatment, or emergency advice.
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