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My dog ate pizza with onion. Should I be worried? What symptoms?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | neutered | 22 lbs

My dog got into my dominos supreme pizza and ate about 5 and a half slices, should I be worried? There was onion on the pizza

1 Answer

Most Helpful Answer

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Answered By Stacey Anstaett, DVM

Veterinarian

Published on April 24th, 2019

It is unlikely that there was enough onion present to cause a problem, but eating that much pizza will likely cause some gastroenteritis (inflammation of the stomach and intestines) which could lead to vomiting and diarrhea. He could also develop pancreatitis. If he starts vomiting, having diarrhea, isn't wanting to eat, or seems lethargic, please take him to your vet for treatment. In the meantime, withhold for at least 12 hours, then offer small amounts of. a bland diet such as boiled chicken and white rice for the next couple of days. Onions will cause oxidative damage to the red blood cells which can result in anemia. If the onions are going to be an issue, it will be a few days before you would see this, and generally would present as decreased appetite and lethargy. If those symptoms are noted, get him in to your vet for bloodwork. Again, I doubt there was enough onion present to be a problem. as generally its a relatively large amount that has to be ingested to cause a clinical problem. thanks for asking Petco Pet Education Center, formerly Petcoach!

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