Can Cats eat Tomatoes?
Skip tomatoes — the plant is the real hazard
Ripe red tomato flesh contains only trace levels of tomatine and poses minimal risk if a cat takes a small bite, but it offers cats no nutritional benefit worth the trade-off. The true danger lies in the green parts: leaves, stems, unripe fruit, and the vine itself concentrate glycoalkaloids at levels that can disrupt a cat's gastrointestinal and nervous system. Because cats are obligate carnivores with limited ability to metabolise plant compounds, even moderate exposure to the green parts warrants concern. The safest policy is simply to keep tomato plants out of reach and not offer tomatoes as a treat.
Moderation Is Essential
Tomatoes should only be offered to cats in small, infrequent amounts. Follow the safe feeding guidance and watch closely for any reactions.
Why are tomatoes risky for cats?
Tomatoes — cats.
Tomatoes belong to the Solanaceae family, which includes nightshade plants. The primary toxic compounds are tomatine (a steroidal glycoalkaloid) and solanine, both of which concentrate heavily in the leaves, stems, roots, and unripe green fruit of the plant. Ripe red tomatoes retain only very low residual levels of tomatine — generally under 5 mg per 100 g of fresh weight — but the green portions can carry 50–100 times that concentration. Cats are small animals, and their detoxification pathways handle alkaloids less efficiently than omnivores or humans do, meaning even a few grams of chewed leaf or stem material can trigger visible clinical signs.
Tomatine and solanine act primarily by inhibiting acetylcholinesterase activity and disrupting cell membrane integrity in the gastrointestinal tract. In practical terms, a cat that chews on a tomato vine or eats an unripe tomato may develop drooling, vomiting, and abdominal pain within an hour, sometimes progressing to trembling or ataxia if the dose is high enough. Ripe tomato flesh — think a small piece accidentally ingested from your plate — is unlikely to produce more than mild stomach upset, if anything at all. The risk therefore scales sharply with which part of the plant was eaten, how much, and the size of the cat. A 4 kg cat eating a bite of ripe tomato is in a very different clinical position from one that has been chewing tomato plant leaves in the garden.
Many cat owners focus on the ripe tomato sitting on the counter, but the real hazard is the potted tomato plant or garden vine. Cats that go outdoors or live in homes with indoor vegetable gardens can easily chew on stems and leaves — exposure that is both more common and more dangerous than eating ripe flesh.
Symptoms & progression
- Hypersalivation / excessive drooling
- Vomiting
- Diarrhea
- Abdominal discomfort or guarding
- Loss of appetite
- Muscle weakness
- Trembling or tremors
- Ataxia (unsteady gait)
- Dilated pupils
- Bradycardia (slow heart rate)
- Lethargy and depression
- Confusion or disorientation
- Hypothermia in severe cases
Dose & severity
Risk varies dramatically depending on which part of the tomato plant was ingested and the size of the cat. Use this table as a clinical reference, not a feeding guide — tomatoes are not a recommended food for cats.
What to do if your cat has eaten tomato
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1
Identify what was eaten. Determine whether your cat ate ripe flesh, unripe fruit, or any green plant material (leaves, stems, vine). This distinction drives urgency — ripe flesh warrants watchful waiting, while green parts warrant faster action.
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2
Estimate the amount. A nibble of ripe tomato from a 5 kg cat is very different from a cat that has been grazing on a tomato plant. Try to quantify how much and call your vet or the ASPCA Animal Poison Control Center (888-426-4435) if you are unsure.
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3
Watch for symptoms for at least 4 hours. Onset of signs from tomatine typically occurs within 30 minutes to 4 hours. If your cat remains bright, eating, and shows no vomiting or drooling after this window, the risk of serious toxicity is low.
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4
Seek veterinary care if any neurological signs appear. Tremors, ataxia, or significant lethargy following tomato ingestion — especially green plant parts — warrant prompt veterinary assessment. Supportive care including anti-emetics and IV fluids may be needed for moderate cases.
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5
Do not induce vomiting at home. Cats are poor candidates for at-home emesis induction. Hydrogen peroxide is dangerous in cats and should never be used. If decontamination is warranted, a veterinarian will administer it safely.
Safe alternatives
If you want to offer your cat a fresh, plant-based treat with genuine safety credentials, these options are far better choices than tomatoes.
Easily digestible, low-calorie, and a mild source of soluble fiber that can actually support feline gut motility — a true functional food for cats in small amounts.
Very low in oxalates and solanine; the bland flavor is tolerated well and it poses essentially no toxicity risk in small quantities.
Widely considered safe for cats; antioxidant-rich and low in sugar relative to many fruits, though cats lack sweet taste receptors so portion size should remain very small.
The gold-standard safe treat for cats — species-appropriate, high-protein, and free of the plant-derived alkaloid risks entirely.
Frequently asked questions
My cat licked the juice from a ripe tomato slice — should I be worried?
Are cherry tomatoes or heirloom varieties less toxic than regular tomatoes?
Can cats eat tomato-based sauces or canned tomato products?
Sources & references
- ASPCA Animal Poison Control Center — Tomato (Solanum lycopersicum) toxic plant listing
- Merck Veterinary Manual — Solanaceae Toxicosis in Small Animals
- Friedman M. (2002). Tomato glycoalkaloids: Role in the plant and in the diet. Journal of Agricultural and Food Chemistry, 50(21), 5751–5780.
- Pet Poison Helpline — Nightshade family plant toxicity overview for companion animals
About the author: Dra. Carmen Ortega
Diplomate of veterinary nutrition focused on species-appropriate diets and preventative feeding, and lead author of our dietary guidance.
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