Foods Cats Should Never Eat
Updated 21 September 2026 — expanded to 25 dangers, with a "why cats are different" section, a dose-size table, the hidden-ingredient checklist, the non-food hazards every cat owner should know, and step-by-step emergency instructions.
Cats are obligate carnivores with livers that handle some toxins even less well than dogs — so a "tiny taste" can matter more than you'd think. Worse, a few foods people assume are cat-friendly (hello, saucer of milk) are on this list. Here's what to keep away, how serious each is, the signs to watch, and what to do in an emergency.
Call your vet or a pet poison helpline right away: ASPCA Animal Poison Control 888-426-4435 or Pet Poison Helpline 855-764-7661. Have your cat's weight, what and how much was eaten, and the time ready. Don't induce vomiting unless a professional tells you to.
Why cats aren't just small dogs
Most "toxic foods" lists get written for dogs and then reused for cats, and that undersells the risk in three specific ways.
1. Their liver processes things differently. Cats have very little of an enzyme pathway (glucuronidation) that mammals use to package up and excrete many compounds. That's the reason a single regular-strength acetaminophen tablet can be lethal to a cat when the same tablet barely registers in a person — and it's why cats are more sensitive than dogs to onion, garlic and several essential oils.
2. They're tiny. The average adult cat weighs 8–11 lb. A "small piece" of something is a vastly bigger dose relative to body weight than the same piece would be for a 70-lb dog, let alone a person.
3. They groom. Cats don't have to eat a toxin to swallow it. Anything that lands on the coat or paws — spilled sauce, a dusting of pollen, a drop of essential oil — ends up in the mouth within minutes.
| Cat's weight | Same dose is like a 150-lb person eating… | Why it matters |
|---|---|---|
| 4 lb (kitten) | ≈ 37× the amount | One grape is a serious ingestion, not a nibble |
| 8 lb | ≈ 19× the amount | A teaspoon of onion gravy is a real exposure |
| 11 lb | ≈ 14× the amount | Half a square of baking chocolate is not "a taste" |
| 16 lb (large cat) | ≈ 9× the amount | Bigger buffer — still nothing like a person's |
This is a rough illustration of scale, not a dosing chart. Toxicity depends on the substance as much as the amount, and for some things on this list — grapes and lilies in particular — there's no known safe dose at all.
The dangerous ones
The whole allium family Severe
Onion, garlic, chives, leeks, shallots and green onions all damage a cat's red blood cells and cause anemia — and cats are more sensitive than dogs. Every form counts: raw, cooked, dehydrated, powdered, in baby food, broth or seasoning blends. The ASPCA notes garlic is roughly 3–5× more toxic than onion, so garlic powder in a "tiny" amount of leftovers is worth a phone call.
Signs (often delayed a day or more): weakness, pale or muddy gums, fast breathing, dark urine, off food.
Onion → Garlic → Chives → Leek → Shallot → Green onion →Chocolate & caffeine Severe
Theobromine and caffeine over-stimulate a cat's heart and nervous system. Cats rarely seek out sweets, but baking chocolate, coffee grounds and tea bags are real risks.
Signs: restlessness, vomiting, racing heart, tremors.
Chocolate → Caffeine →Grapes & raisins Severe
Linked to sudden kidney failure in pets, and the reaction is unpredictable — there's no known "safe" amount.
Signs: vomiting, lethargy, reduced or no urination.
Grapes → Raisins →Alcohol Severe
Toxic in tiny amounts for a small cat — and it hides in raw dough, desserts and unattended drinks.
Signs: wobbliness, drooling, slowed breathing.
Full guide →Xylitol Severe
This sugar-free sweetener (gum, candy, some peanut butters) is dangerous for pets — keep anything "sugar-free" well out of reach.
Signs: sudden weakness, collapse.
Full guide →Raw bread dough High
A double danger: it rises in the warm stomach (painful bloat) and the fermenting yeast produces alcohol.
Signs: swollen belly, retching, drooling, wobbliness.
Full guide →Nutmeg High
Contains myristicin, which affects the nervous system in larger amounts — watch holiday baking and eggnog.
Signs: disorientation, racing heart, belly pain.
Full guide →Salt & salty foods High
Chips, deli meat, jerky, stock cubes and the salt-dough ornaments that come out in December can push a small cat into sodium poisoning, which affects the brain and kidneys.
Signs: heavy thirst, vomiting, wobbliness, tremors.
Salt → Chips →Macadamia nuts & walnuts High
Macadamias are the famous problem nut, and walnuts add a second risk: they mold easily, and moldy nuts carry tremor-causing mycotoxins. Nuts in general are a poor fit for cats anyway — high fat, easy to choke on, and usually salted.
Signs: weakness or wobbly back legs, vomiting, tremors.
Macadamia → Walnuts →Wild mushrooms Severe
Plain cooked button mushrooms from the shop aren't toxic, but they're also pointless for a cat. The real danger is the ones that appear on the lawn after rain — some species cause liver failure, and identification isn't something to attempt at home.
Signs: drooling, vomiting, yellow gums, staggering, seizures.
Full guide →Marijuana & edibles Severe
Cannabis ingestions have climbed steeply on poison-control lists in recent years, and edibles are the worst version: the cat gets THC plus chocolate, butter or xylitol in one bite. Vets can treat this — they just need to know what was actually eaten, so be straight with them.
Signs: severe wobbliness, dilated pupils, dribbling urine, low temperature, agitation.
Full guide →Moldy food & bin raids High
Mold on bread, cheese, pasta or fallen fruit can produce tremorgenic mycotoxins, which hit the nervous system fast. Cats aren't usually bin divers, but a forgotten plate on the counter is well within reach.
Signs: muscle tremors, twitching, vomiting, seizures — often within hours.
Full guide →Cooked bones High
Cooked bones splinter instead of crushing. Chicken and fish bones from the plate are the usual culprits, and the risk is mechanical: a punctured gut or an obstruction, not poisoning.
Signs: gagging, pawing at the mouth, straining, bloody stool, refusing food.
Full guide →🐟 The surprising ones — foods people think are fine
Milk & dairy Common myth
The classic saucer of milk is a myth — most adult cats are lactose intolerant, so milk and cheese cause stomach upset and diarrhea rather than a treat.
Signs: diarrhea, gas, upset stomach.
Milk → Cheese →Raw fish & too much tuna Risky habit
Raw fish contains an enzyme that destroys vitamin B1 (thiamine), and a steady diet of canned tuna can lead to deficiency and mercury concerns. An occasional bite of cooked fish is fine — a tuna habit isn't.
Signs of B1 deficiency: wobbliness, poor appetite, neurological signs.
Raw fish → Tuna →Too much liver In excess
A little cooked liver is fine, but a lot — over time — delivers too much vitamin A and can affect the bones and joints.
Signs: stiffness, lethargy over time.
Full guide →Raw meat & raw egg Risky habit
"Cats eat raw prey in the wild" is true and not the whole story. Raw chicken and raw egg carry salmonella and campylobacter — which the cat can shed into the house even without getting sick — and raw egg white contains avidin, which blocks biotin absorption over time.
Signs: vomiting, diarrhea, fever, poor coat condition over the long run.
Raw chicken → Raw egg →Gravy, soy sauce & seasoned sauces Hidden allium
This is the one that catches careful owners out. Gravy, stock, soy sauce, ketchup and most marinades are built on onion and garlic powder plus a lot of salt — which is exactly why "just a spoonful of the juices" from the roast is one of the most common holiday calls vets take.
Signs: thirst and vomiting early; allium signs can take a day or more.
Gravy → Soy sauce → Ketchup →Bacon, ham & deli meat Not a treat
It's meat, so it feels like the right kind of food for a carnivore. The problem is what's around the meat: enormous amounts of salt, nitrates and fat, which can trigger pancreatitis in a small animal. A cat-sized portion of bacon is about the size of a pea, which rather defeats the point.
Signs: vomiting, hunched posture and belly pain, lethargy, no appetite.
Bacon → Ham → Hot dogs →Ice cream, whipped cream & sweets Common myth
Cats can't taste sugar, so the appeal is the fat and the dairy — and both cause the same upset stomach as milk. Worse, sweet things are where xylitol and chocolate hide. The "cat gets a lick of the ice cream" photo is cute; the 3am cleanup isn't.
Signs: diarrhea, gas, vomiting.
Ice cream → Whipped cream →Citrus, avocado & the "healthy" human snacks Skip it
Lemon, lime, orange and grapefruit contain oils and psoralens that irritate a cat's stomach and skin — and most cats hate the smell anyway, which is a decent instinct. Avocado isn't the emergency it's rumored to be for cats, but it's very high in fat and the pit is a genuine obstruction risk.
Signs: drooling, vomiting, diarrhea.
Citrus → Avocado →Dog food Long-term risk
One stolen mouthful from the dog's bowl is not a poisoning. But dog food doesn't contain the taurine, arachidonic acid, vitamin A and B-vitamin levels a cat's body can't make for itself — and a cat living on it develops heart and eye problems. Feed them separately, and do it consistently.
Signs of taurine deficiency: failing vision, weakness, heart disease — slow and often silent.
🕵️ The hidden-ingredient checklist
Almost nobody feeds their cat an onion. What actually happens is that onion and garlic arrive inside something else. If any of these are in your kitchen, they're worth a second look before a cat gets near them:
- Baby food — often contains onion powder, and it's a classic "gentle food for a sick cat" recommendation from the internet. Check the label every time.
- Stock, broth and bouillon cubes — allium plus a startling amount of salt. Even "for pets" bone broths vary; read them.
- Garlic bread, pizza crusts and pasta sauce — garlic in concentrated, tempting-smelling form. More on pizza →
- Seasoning blends — taco, curry, poultry, "everything" and BBQ rubs are mostly onion and garlic powder by volume.
- Sugar-free anything — gum, mints, protein bars, some peanut butters, even some children's medicines contain xylitol.
- Trail mix and baked goods — the raisin and chocolate delivery system.
- Homemade cat treat recipes — online recipes are unregulated. Plenty call for garlic powder "for flavor."
🌸 Beyond the plate — the non-food hazards worth knowing
This is a food guide, but it would be irresponsible to write about cat poisonings and skip these four. They send more cats to emergency vets than most of the foods above.
Lilies Life-threatening
True lilies and daylilies are in a category of their own. The entire plant is toxic to cats — stem, leaves, petals, pollen and the water in the vase. Per the ASPCA and FDA, a cat can develop fatal kidney failure from licking a few grains of pollen off its fur, and treatment is often too late if it starts more than 18 hours after exposure. Bouquets are a common route in. If someone sends you flowers, check the stems before the cat does.
Signs: drooling, vomiting, going off food and quiet within 0–12 hours; increased urination and dehydration at 12–24 hours; kidney failure at 24–72 hours.
Full guide →Human painkillers Life-threatening
This is the glucuronidation problem at its worst. A single regular-strength acetaminophen (paracetamol) tablet can kill a cat, and ibuprofen and naproxen are also dangerous. Never medicate a cat with anything from the human cabinet, and keep handbags and bedside tables shut.
Signs: brown or muddy gums, swollen face or paws, laboured breathing, lethargy.
Acetaminophen → Ibuprofen →String, tinsel, hair ties & ribbon Surgical risk
Cats can't spit out string — backward-facing barbs on the tongue mean it only goes one way. A "linear foreign body" saws through the intestine and is a genuine surgical emergency, and it's one of the most common Christmas-tree accidents there is.
Signs: repeated vomiting, no appetite, string visible at the mouth or rear (never pull it — call the vet).
String → Hair ties →Essential oils & diffusers High
Tea tree, citrus, pine, eucalyptus, peppermint and wintergreen are all problems for cats, and a diffuser puts oil onto the coat, which the cat then grooms off. Tea tree oil is the one most often involved in serious cases.
Signs: drooling, wobbliness, tremors, breathing changes, chemical smell on the fur.
Full guide →What cats CAN have — safe treats
Want to spoil your cat safely? Stick to plain, cooked, unseasoned protein in small amounts — tap any to see how much:
Keep any extra to about 10% of your cat's daily calories — for most cats that's genuinely a teaspoon-sized amount. The rest should come from a complete cat food, because a cat's nutritional requirements are far narrower than a dog's.
🆘 What to do if your cat ate something
The window matters more than the symptoms. With alliums, lilies and acetaminophen, a cat can look completely normal for hours while damage is already happening — so the rule is to act on what was eaten, not on how the cat seems.
- Separate the cat from the rest of it. Shut them in a room with water. Don't clean up yet — you need the evidence.
- Work out the three numbers. Your cat's weight, roughly how much was eaten, and what time. Take the packaging or a photo of it; percentages and ingredient lists matter enormously.
- Call before you do anything else. Your vet, an emergency clinic, ASPCA Animal Poison Control on 888-426-4435, or Pet Poison Helpline on 855-764-7661. Both helplines charge a consultation fee and both are worth it at 2am.
- Do not induce vomiting. Not with salt, not with hydrogen peroxide — peroxide can cause severe stomach damage in cats, and some substances do more harm coming back up. Only if a professional instructs you.
- Don't give home remedies. No milk, no oil, no human medication, no activated charcoal unless you've been told to.
- Go in if you're told to, and go in early. Treatment for most of this list is dramatically more effective in the first few hours. A precautionary visit is cheap next to kidney failure.
Frequently asked questions
Can cats drink milk?
Most can't comfortably — adult cats are usually lactose intolerant, so milk causes stomach upset. Fresh water is all they need.
Is a little tuna okay?
An occasional bite of plain cooked fish is fine. The problem is tuna as a regular food — it isn't balanced for cats and raw fish can cause a vitamin B1 deficiency.
My cat licked something with onion in it — should I worry?
Possibly. Cats are very sensitive to alliums and signs can be delayed a day or more, so call a poison line with your cat's weight rather than waiting.
What's the first thing to do in an emergency?
Call your vet or a poison line (ASPCA 888-426-4435 / Pet Poison Helpline 855-764-7661) with the details, and don't induce vomiting unless told to. Our emergency tool walks you through it.
Why are cats more sensitive than dogs to the same foods?
Mostly their liver. Cats have very little of the glucuronidation pathway that other mammals use to clear many compounds, so things like onion, garlic, some essential oils and human painkillers linger and do more damage. They're also much smaller, and they groom whatever lands on their coat straight into their mouth.
My cat stole a bite of the dog's food. Is that dangerous?
One mouthful, no. Dog food isn't toxic — it's just incomplete for a cat, missing the taurine, vitamin A and arachidonic acid levels cats can't produce themselves. The problem is dog food as a habit, not as an accident.
Are lilies really that serious?
Yes — of everything in this guide, lilies are the one that most often ends badly. The whole plant including the pollen and the vase water can cause fatal kidney failure in a cat, and treatment needs to start within hours. If there are true lilies or daylilies in your home and you have a cat, the safest move is to get them out of the house.
Can I give my cat a bone to chew?
Not a cooked one — cooked bones splinter and cause obstructions and perforations. Raw bones carry their own bacterial risk. Dental health in cats is better served by a veterinary dental diet, dental treats or (if your cat tolerates it) actual tooth brushing.
What about "natural" or "organic" versions — garlic supplements, for example?
Natural and organic labels have no bearing on toxicity. The ASPCA specifically flags this: onion, garlic, chocolate, grapes, raisins, avocado and macadamia nuts should be avoided regardless of how they're marketed. Garlic supplements sold as flea remedies are best skipped entirely.
How do I stop a determined counter-surfer?
Manage the environment rather than the cat. Food goes away immediately after cooking, bins get a lid, dishwasher gets shut, and nothing is left to cool on a counter. Feeding your cat at the same time you eat gives them somewhere better to be. Try our Kitchen Hunt game for a quick tour of where hazards actually hide.
Sources & method: compiled from the ASPCA Animal Poison Control Center's people-foods and toxic-plant guidance, the Pet Poison Helpline, the FDA's advisory on lilies and cats, and the Merck Veterinary Manual's entry on Allium toxicosis in animals. Reviewed and expanded by the CanMyPet editorial team on 21 September 2026 — see our sources & review method. This guide is for information only and is not veterinary advice; your own vet knows your cat's weight, age and health history, and should have the final word in any suspected poisoning.