Foods Cats Should Never Eat
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.
The dangerous ones
Onion, garlic & chives Severe
The allium family damages a cat's red blood cells and causes anemia — and cats are more sensitive than dogs. Every form counts: raw, cooked, powdered, in baby food or broth.
Signs (often delayed a day+): weakness, pale gums, fast breathing.
Onion → Garlic →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 and jerky can push a small cat into sodium poisoning, which affects the brain and kidneys.
Signs: heavy thirst, vomiting, wobbliness.
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 →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:
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.
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