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How much tomato is safe for my small dog? Can it cause harm?

Updated On September 23rd, 2025

Pet's info: Dog | Japanese Spitz | Female | spayed | 2 years and 7 months old | 11 lbs

Around how much tomatoes must around 13 lbs dog eat to cause harm to her health? Cause she often got tomato sauce, but I recently found out too much tomatoes can cause harm.

2 Answers

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on May 3rd, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! I would avoid tomatoe sauce that contains onions and garlic. There is no published “toxic” dose for tomatoes. Every dog is different on how they handle certain fruits and vegetables. I would start small and gradually increase the amount watching for tummy upset manifesting as vomit or diarrhea. I would feed as a treat only. Only feed ripe red tomoatoes. The plant and green tomatoes do contain solanine which is harmful. Everything should be in moderation. Onions and garlic are toxic to animals and I do not recommend any sauce contains those ingredients. Have a great day!

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    Answered By Jennifer Summerfield, DVM CPDT-KA

    Veterinarian, Certified Dog Trainer

    Published on March 3rd, 2018

    Hi there! If Bella just licked a bit of the tomato sauce, I would not expect this to cause any problems at all. It's true that onions can be toxic to dogs, but they need to eat a significant amount in order to cause toxicity issues - I'm not sure how big Bella is, but even a small 10 pound dog would need to eat around four teaspoons of pure onion to cause problems. So normally, just eating a bit of sauce that contains some onion isn't enough to worry about :)

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