True lilies and daylilies, onions and garlic, chocolate, and several medicines and household products can poison cats. Exposure is not limited to eating: pollen or spilled products can be swallowed during grooming. If you suspect contact with a toxin, call a vet immediately rather than waiting for symptoms.
This guide covers important examples, not every poisonous plant or product. Keep the label or plant name so the veterinary team can assess the actual exposure.
Key points: true lilies and daylilies are particularly dangerous, and even pollen or vase water can cause kidney failure. Keep onions, garlic, chocolate, alcohol, caffeine, grapes and raisins away from cats, don’t use concentrated essential oils around them and never give human painkillers. Dog flea products containing permethrin can be deadly to cats. If you suspect poisoning, call a vet or animal poison line straight away and don’t try to make your cat vomit.
Lilies: the one plant to keep out of the house
If you remember only one thing, make it this. Lilies in the Lilium genus (such as Easter, tiger, Asiatic, Oriental and stargazer lilies) and daylilies (Hemerocallis) can cause sudden kidney failure in cats. Petals, leaves, stems and pollen are all toxic, and so is water from the vase they stand in. A cat can be poisoned simply by brushing past a bouquet and then licking pollen off its fur.
Early signs, such as vomiting, drooling, hiding or not eating, can appear within hours and may then seem to ease. That apparent recovery is misleading, because kidney damage continues in the background. Prompt treatment improves the outlook. Do not use a quoted number of hours as a safe waiting period: contact a vet as soon as exposure is suspected.
Urgent: if your cat has chewed any part of a lily, drunk vase water or has lily pollen on its fur or face, contact a vet immediately, even if your cat seems completely normal. Don’t wait for symptoms. Take the plant or a photo of it with you.
Not everything called a “lily” behaves the same way. Peace lilies and calla lilies aren’t true lilies. They irritate the mouth and can cause drooling, pawing at the mouth and vomiting, but they don’t cause kidney failure. Still, if you’re not sure which kind your cat got into, treat it as an emergency. The simplest approach in a cat household is to keep lilies out of bouquets and gardens altogether, and to ask friends not to send them.
Foods to keep off the counter
Cats may encounter harmful foods on plates, in pans or as offered treats. Keep these foods inaccessible:
- Onions, garlic, leeks, chives and shallots. All forms are a problem, including cooked, dried and powdered. Watch for gravy, soup, stock, baby food and seasoned meat. These plants damage red blood cells, and signs of anemia may not show until several days later.
- Chocolate. It contains theobromine and caffeine. The darker the chocolate, and especially baking chocolate and cocoa powder, the more dangerous it is. Cats rarely eat much, but even small amounts can cause vomiting, restlessness and a racing heart.
- Grapes, raisins, dried grape currants and sultanas. These are best known for causing kidney failure in dogs. Evidence in cats is limited, with anecdotal reports of kidney problems. This uncertainty is a reason to avoid offering them and to call your vet after ingestion, rather than assuming the dog risk applies identically to cats.
- Alcohol, caffeine and raw yeast dough. Keep drinks, coffee grounds, supplements and rising dough out of reach. Dough can expand and produce alcohol in the stomach.
Hidden dangers around the house
Human painkillers
Acetaminophen (paracetamol, sold as Tylenol in the US) is one of the most dangerous medicines for cats. Cats lack enough of a liver enzyme needed to process it safely, and a single tablet can be enough to poison a cat. Signs include brown or bluish gums, a swollen face or paws, trouble breathing and weakness. Ibuprofen, naproxen and other anti-inflammatories made for people can cause stomach ulcers and kidney failure in cats, so treat any exposure as an emergency. Never give your cat any human medicine unless your vet has told you to, and keep dropped pills off the floor.
Dog flea treatments containing permethrin
Some spot-on flea treatments for dogs contain permethrin, an insecticide dogs tolerate but cats do not. Poisoning happens when a dog product is put on a cat by mistake, or when a cat rubs against or cuddles up with a recently treated dog. Signs include twitching, tremors and seizures, and it’s an emergency. Read the label of any flea product, only use products made for cats on cats and keep treated dogs away from cats for as long as the label or your vet advises.
Concentrated essential oils
Cats are sensitive to many essential oils, including tea tree, eucalyptus, peppermint, cinnamon, clove, pine, wintergreen and citrus oils. Oils can be absorbed through the skin, swallowed during grooming or inhaled. Never apply oils to your cat, clean up spills quickly and think twice about diffusers that release droplets into the air, especially around cats with asthma. Drooling, vomiting, wobbliness, tremors or breathing trouble after exposure means a vet call.
Quick reference
| Hazard | Where cats meet it | Main concern |
|---|---|---|
| True lilies and daylilies | Bouquets, gardens, pollen on fur, vase water | Sudden kidney failure |
| Onion, garlic, leeks, chives | Leftovers, gravy, stock, seasoned food | Damage to red blood cells (anemia) |
| Chocolate | Baking, cocoa powder, snacks | Vomiting, restlessness, heart rhythm problems, seizures |
| Grapes and raisins | Fruit bowls, baked goods, trail mix | Possible kidney damage |
| Acetaminophen (paracetamol) | Dropped tablets, well-meant home treatment | Damage to red blood cells; can be fatal |
| Permethrin | Dog spot-on flea treatments, recently treated dogs | Tremors and seizures |
| Essential oils | Diffusers, spills, oils put on skin | Drooling, vomiting, wobbliness, breathing and liver problems |
If you suspect your cat has been poisoned
- Move your cat away from the plant, food or product, and keep other pets away from it too.
- Call your vet or an emergency clinic right away. In the US you can also call the ASPCA Animal Poison Control Center at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661. Both are open around the clock and a consultation fee may apply.
- Don’t make your cat vomit or give milk, oil, salt or hydrogen peroxide. Home remedies can cause more harm, and hydrogen peroxide is not safe for cats.
- Gather evidence. Bring the packaging, the plant or a photo, and a rough idea of how much was eaten and when.
Many poisons cause few signs at first, so a cat that “seems fine” is not a reason to wait.
True lilies can damage the kidneys. Our article on why a cat isn’t drinking much water explains which thirst and litter box changes are worth reporting to your vet.
Dog owners will find a similar list in our guide to human foods that are toxic to dogs.
Frequently asked questions
Is lily pollen really dangerous to cats?
Yes. Pollen from true lilies and daylilies can cause kidney failure if a cat licks it off its fur. Contact a vet straight away if you see pollen on your cat, even if it seems well.
Are peace lilies toxic to cats?
Peace lilies are not true lilies. They can irritate the mouth and cause drooling and vomiting, but they don’t cause kidney failure. If you’re not sure what kind of lily your cat chewed, treat it as an emergency.
Can a small amount of garlic hurt my cat?
It can. Garlic and onions in any form, including powder and cooked food, can damage a cat’s red blood cells, and signs may take days to appear. Call your vet if your cat has eaten food containing them.
Can I use my dog’s flea treatment on my cat?
No. Some dog flea products contain permethrin, which can cause tremors, seizures and death in cats. Only use products labeled for cats, and keep cats away from dogs that were just treated.
Should I make my cat vomit if it ate something toxic?
No. Don’t try to make a cat vomit at home. Call your vet or an animal poison line and follow their advice.
Sources and further reading
- FDA: lilies and cats
- Cats Protection: poisoning hazards and action
- Pet Poison Helpline: feline hazards and the limits of grape evidence
- Pet Poison Helpline: essential oils and cats
- ASPCA: foods to keep away from pets
General education only; exposure needs individual veterinary assessment. See our Pet Health Disclaimer. Editorial update: September 27, 2026.
