Can Cats Eat Tomatoes? Ripe Fruit, Green Plant and Sauce Risks
Tomatoes sit in a gray area for pets. The ripe red fruit is widely eaten by people and is often described as safe for cats, yet the plant belongs to the nightshade family, which has a reputation for toxins. Both pictures are partly right, and the details matter.
Fruit versus plant
Tomatoes contain tomatine, a glycoalkaloid that protects the plant from fungi and insects. The concentration is highest in the leaves, stems and green fruit, and it falls as the fruit ripens. Related compounds, such as solanine, appear in other nightshades, including potatoes and eggplant. In a ripe red tomato, the level of tomatine is low, and small amounts are unlikely to harm a cat. Green tomatoes and plant material are a different story.
Quick reference
| Part or product | Verdict |
|---|---|
| Ripe red flesh, tiny piece | Low risk, occasional |
| Green, unripe tomatoes | Avoid |
| Stems, leaves and vines | Avoid, more toxic |
| Cherry tomatoes | Same as ripe flesh, but a choking risk if whole |
| Tomato sauce, ketchup, soup | Avoid, onion, garlic, salt, sugar |
| Sun-dried tomatoes | Avoid, concentrated salt |
| Tomato juice | Avoid, sodium |
Signs of tomatine poisoning
If a cat eats a large amount of plant parts or green tomatoes, signs may include:
- Drooling and nausea
- Vomiting and diarrhea
- Loss of appetite
- Lethargy and weakness
- Dilated pupils or confusion
- Slow heart rate, in severe cases
Most cases are mild, but a cat that shows neurological signs or a slow heart rate needs urgent veterinary care. See the emergency warning signs guide and use our US vet directory to find a clinic.
Sauces and prepared dishes
Prepared tomato dishes are a bigger problem than the fruit. Pasta sauce, pizza sauce, soup and ketchup commonly contain onion, garlic, salt and sugar. Onion and garlic damage red blood cells, as covered in are onions and garlic toxic to cats. Many sauces also contain herbs and oils that can upset the stomach. Salsa may have jalapeno and onion.
How to offer a taste
If you want to share, choose a ripe red tomato, remove the stem and any green parts, and cut a piece the size of a pea. Offer it and watch for a reaction. Most cats ignore it. Stop if your cat shows any digestive upset. Count treats within about 10 percent of daily calories, and use our cat food amount calculator to plan.
Tomato plants at home
Many people grow tomatoes on a patio or indoors, and cats are tempted to chew the leaves or knock over pots. To reduce risk:
- Grow plants in places cats cannot reach, such as hanging planters or a closed greenhouse.
- Use cages or netting over garden beds.
- Avoid fertilizers, pesticides and slug baits that are toxic to pets.
- Pick up fallen fruit, which may rot and grow mold.
- Provide safe cat grass as an alternative.
See toxic houseplants for cats for related hazards, and the cat-safe houseplants guide for alternatives.
When to skip tomatoes
- Cats with a sensitive stomach. The acidity can cause upset.
- Cats with urinary or kidney issues. Ask your vet about any additions.
- Cats on a prescription diet. Extras may interfere.
- Kittens. They should eat complete kitten food.
What to do after exposure
- Remove any remaining plant material or fruit.
- Note what was eaten, how much and when.
- Watch your cat for signs for the next day.
- Call your vet or an animal poison helpline if your cat ate green parts, a lot of plant, or any prepared dish with onion or garlic.
Is tomato safe in cat food?
Some commercial cat foods list tomato pomace or tomato fiber as an ingredient. In those foods, it is a processed byproduct used in small quantity, and manufacturers account for it in the formulation. This is different from giving a cat fresh tomatoes or plant parts, and it does not mean that raw tomatoes are a good addition to a bowl.
Other nightshades
Tomatoes belong to the same family as potatoes, eggplant and peppers. The green parts of potato plants and sprouted or green potatoes carry solanine, and raw potato is not a good choice for a cat. Cooked plain potato is less risky but offers little. When in doubt, use the cat food and plant safety checker or ask your veterinarian.
Quick safety checklist
- Is the tomato fully ripe and red, with stem and green parts removed?
- Is it plain, with no sauce, salt, onion or garlic?
- Is the piece tiny and cut so it cannot be swallowed whole?
- Is your cat kept away from the plants themselves?
If all answers are yes, a taste is low risk. If any answer is no, skip it.
Better treats
Plain cooked chicken is a safer choice. For other foods, use our free cat food and plant safety checker, and ask your veterinarian if you are unsure.
Frequently asked questions
Are tomatoes toxic to cats?
Ripe fruit is low risk in small amounts, but the green parts of the plant are more toxic and should be avoided.
Can cats eat tomato sauce?
No. It often contains onion and garlic and plenty of salt.
Why does my cat eat tomato plants?
Cats chew plants out of curiosity, boredom or digestive upset, which is why access should be blocked.
What are signs of tomato plant poisoning?
Drooling, vomiting, diarrhea, weakness, slowed heart rate and confusion, in more serious cases.
Sources and further reading
Pet food rules and nutrient standards come from regulators and professional bodies. Start here when you want the primary source.
- AAFCO: pet foodThe body behind U.S. pet food nutrient profiles and labeling standards.
- ASPCA Animal Poison Control CenterToxic plants and foods lists, plus a 24-hour helpline.
- Pet Poison Helpline24-hour poison advice staffed by veterinary toxicologists.
Tailwisp is independent and written under our editorial policy. Learn who we are, or browse all cat guides.
This article is general educational information, not veterinary advice. Every cat is different. If your cat is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.