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My cat ate onions and threw up. Is he safe from onion toxicity?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 4 months and 19 days old | 10 lbs

Hi so the other day I gave my cat some meat that I had bought cooked I didn’t realize that it had onions until he was half through done eating it. This happened around 1pm he was fine through out the day he was still eating his meals (cat food).But now it 4am and he vomited the vomit is solid and has the onions in it. Should I be worried or is it a good sign he got all the onions out of his system? He was fine after words he even tried to eat his vomit but I stopped him in time. Need advice fast

2 Answers

Most Helpful Answer

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Answered By Maria DVM

Veterinarian

Published on July 29th, 2018

I do recommend taking Chandler to your veterinarian. It is great that he vomited some onions up but my concern is there can be more. Here is some information on onion toxicity in pets: https://phz8.petinsurance.com/pet-health/pet-toxins/pets-and-onions Thank you for using PetCoach.

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Other Answers

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    Answered By Bobbi Musgrove, DVM

    Veterinarian

    Published on March 11th, 2017

    You are right to be concerned. Raw/uncooked onions can be toxic to cats and dogs. I would be concerned that even a very small amount can be toxic for Noel because she is young and still small in size. It is very likely too late to take measures to induce vomiting the onion up but it would be best to have Noel examined by your veterinarian or an emergency veterinary clinic ASAP to take measures to treat the toxicity. You can also contact the Pet Poison Hotline 855-764-7661 or the ASPCA poison control hotline 866-426-4435 to start a consultation with a toxicologist and find out more information.

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