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Help! My dog ate tomato leaves. Are they poisonous? What to do?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | 3 years and 2 months old

I think my dog ate some tomato leaves

2 Answers

Most Helpful Answer

David Elbeze, DVM, MRCVS

Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on May 15th, 2016

The leaves of a tomato plant contain the glycoalkaloids alpha-tomatine and dehydrotomatine. These substances are toxic to both pets and people. If your cat or dog eats the leaves, he might experience lethargy, drooling, stomach upset, diarrhea, vomiting and changes in his behavior. Tremors or seizures could also occur. If you have observed or suspect your pup has munched on your tomato plants, it's best to get him to the vet so he can be treated. Poisoning is a serious situation and you should visit an emergency vet if your regular vet isn't available.
Vote Icon6Pet Parents found this answer helpful

Related Answers from Veterinarians

  • Answered By Dr. B. DVM, DACVIM (Oncology)

    Veterinarian

    Published on August 12th, 2018

    You are correct that ingestion of an unripe tomato is more concerning due to higher concentrations of a substance called tomatine. But, it sounds like this tomato was not green, so likely contained less. Although you do not know what animal previously ate it, it is unlikely to cause harm to your pup. Keep an eye out for tummy upset, weakness, or wobblyness and if noted see your vet for supportive care. I have attached a link below as well. I hope this helps and thank you for using PetCoach!

    https://www.petpoisonhelpline.com/pet-safety-tips/are-tomatoes-poisonous-to-dogs/

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    1Pet Parents found this answer helpful

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