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My dog ate a sandwich with onion. Should I worry about onion toxicity?

Updated On September 23rd, 2025

Pet's info: Dog | Boxer | Female | 75 lbs

I have a 75lb boxer and she fot I to the trash and ate a sandwich that had some chopped up onion on it . Will she be ok ?

1 Answer

Most Helpful Answer

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Answered By Tomasz Wnuk

Veterinarian

Published on August 2nd, 2020

Hello and thank you for contacting Petco Pet Education Center, formerly Petcoach. Onion in toxic to dogs but the toxic dose is fairly high. Sadie would have to eat more than a half of a large onion (or a whole normal size onion) to get into any trouble. She may show mild signs of stomach upset, like a bout of vomit or loose stools but there should not be any more concerning symptoms.

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