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My big dog ate cooked onions. Should I worry or induce vomiting?

Updated On September 23rd, 2025

Pet's info: Dog | Goldendoodle | Female | spayed | 4 years and 4 months old | 65 lbs

My big dog jumped onto the table and ate beef and onions. I don't think that she ate that much, but she definitely ate more beef than onion (maybe 1-5 rings of cooked onion). She is acting normal and I made her eat water, what should I do? Should I induce vomiting?

2 Answers

Most Helpful Answer

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Answered By David Darvishian

Veterinarian

Published on August 8th, 2017

Hi again. I searched all found one short article on a Veterinary only site called Veterinary Information Network. I'll paste it here for you to read. Please let us know if you have any more questions. A dog of Macey's size would have to consume quite a large quantity to cause toxicosis. Onions. She is almost 30kg so she would have to eat almost 900 grams of onions to even get close to having a problem. Onions are members of the genus Allium (Other members of this genus include garlic, leek, shallot, and chive). Pieces of onion, onion powder, or even cooked onion, can cause damage to red blood cells which could result in anemia in both dogs and cats. The primary toxic component is n-propyl disulfide, which is thought to cause oxidative damage to erythrocytes, resulting in hemolysis. Toxicoses from fresh, dried, or, powdered plant material have been reported in dogs and cats. In one study, dogs developed hemolytic anemia after being fed 30 g/kg of onions once daily for 3 days.5 Feeding commercial baby food containing onion powder has also been reported to cause toxicity in cats. I hope this helps

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    Answered By David Darvishian

    Veterinarian

    Published on

    Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear that Macey was table surfing and got into your food. Raw onions in large quantities can cause problems with the red blood cells of dogs and may also cause some intestinal upset like nausea, vomiting, gas, and diarrhea. I think Macey is going to be ok but I would watch for the above signs and if any of those occur, I would contact your veterinarian to discuss what happened. Your vet may want to evaluate her, possibly run a few blood tests, and then recommend some treatment for any intestinal signs. So I would just keep a close eye on her in the mean time and just make sure to be a little more careful in the future with human food that is within her reach. Good luck with Macey.

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