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My cat ate Subway tuna salad with onion. Is it safe for her?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | spayed | 12 years old

Will my cat be okay after eating a few bites of tuna from Subway? I fell asleep after almost finishing a tuna salad (made with mayo I assume) sandwich from subway. A bunch of veggies on it including onion, and black pepper and chipotle sauce. When I woke the tuna had been licked out. I think most of the veggies were eaten by me before I fell asleep. Could have been any time between 6 hours ago & now. My cat is 12 years old and has asthma. I am with her now and she seems totally fine.

1 Answer

Most Helpful Answer

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Answered By Jennifer Summerfield, DVM CPDT-KA

Veterinarian, Certified Dog Trainer

Published on January 8th, 2017

The tuna salad itself should not cause any serious problems at all. The only thing on your list that is potentially toxic to cats is onion - so you think she may have eaten a significant amount of onion, it would be best to take her to the vet to be safe. Otherwise, I would not expect her to have any serious issues. You may see some mild stomach upset for the next day or so, if she isn't used to eating human food like this, but no toxicity concerns.

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