No. Onions are toxic to cats in any form — raw, cooked, powdered, or dehydrated. They damage red blood cells and can cause anemia, and cats are especially sensitive. The danger hides in everyday foods like broth, baby food, and gravy, so onion exposure is easy to miss.
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Danger — even a small amountTreat it as a poisoning risk
Can cats eat onions? 🧅
No. Onions are toxic to cats in any form — raw, cooked, powdered, or dehydrated. They damage red blood cells and can cause anemia, and cats are especially sensitive. The danger hides in everyday foods like broth, baby food, and gravy, so onion exposure is easy to miss.
Source-linked record · Last reviewed July 17, 2026 · Not veterinary advice
Why this answer
Onions belong to the Allium family and contain organosulfur compounds that oxidize a cat's red blood cells, forming Heinz bodies and triggering hemolytic anemia. Cooking and drying do not remove the toxin, and cats are more susceptible than many animals, so even seasoning-level amounts eaten regularly can add up to serious harm.
Watch for
Weakness, lethargy, and pale gums
Reddish or brown urine
Rapid breathing or a fast heart rate
Vomiting, diarrhea, or loss of appetite
How much is okay
None — never feed onion in any form, and avoid table scraps, broths, and baby foods that contain onion or onion powder.
Keep it away
Keep raw and cooked onions off counters and out of reach.
Check labels on broth, gravy, baby food, and seasoning blends for onion.
Never share soups, stir-fries, or leftovers seasoned with onion.
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.
Poison List
Pet Poison Helpline — Veterinarian-maintained toxin database for dogs and cats, reachable at (855) 764-7661, with per-substance toxicity levels, signs, and species notes.
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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