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.
3 Answers
Most Helpful Answer
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.
11Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on July 29th, 2018
I do recommend taking Chandler to your veterinarian. It is great that he vomited some onions up but my concern is there can be more. Here is some information on onion toxicity in pets: https://phz8.petinsurance.com/pet-health/pet-toxins/pets-and-onions Thank you for using PetCoach.
1Pet Parents found this answer helpful
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Published on April 16th, 2018
Hi, thanks for using Petco Pet Education Center, formerly Petcoach! It is hard to guide you since you do not know if or how much onion there was in the tuna. I can tell you that most of the time the pets are fine. If she is acting fine then I wouldn't rush to the ER. Onion toxicity isn't immediate and it usually is when they eat a lot of there is chronic exposure. I think you can wait for your Vet to open and if you are still nervous have her examined and some blood work done. Have a great day!
1Pet Parents found this answer helpful
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