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My dog ate a large supreme pizza with onions. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | American Staffordshire Terrier | Male | neutered | 3 years and 3 months old | 61.6 lbs

I left a large supreme pizza (onions) on my table while I was at work and my dog ate the entire thing. I know onions are “toxic” to dogs. Will he be okay?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on January 20th, 2018

Oh no, that wasn't good that Stimpy at the pizza and onions. You are correct that onions are toxic, but the pizza itself also poses a big problem. Pizza is fatty and greasy, and that amount of fat and grease could be enough to trigger pancreatitis. Pancreatitis is extremely painful, very serious, and can be fatal. The toxic dose for onions is 15-30 grams per 1kg body weight. For him, that would be 422-845 grams of onions. The pizza likely did not contain that amount of onions, so I am more worried about the fat and grease. You need to monitor him closely. If Stimpy starts vomiting, becomes anorexia, has a painful abdomen, hunched back, distended abdomen, and/or lethargy, those can be signs of pancreatitis and he has to see a vet immediately. Good luck, I hope this helps!

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2Pet Parents found this answer helpful

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