Tomato plants are toxic to dogs, but the risk depends on which part your dog ate
Yes, tomato plants are poisonous to dogs. The stems, leaves, and unripe green tomatoes contain solanine, a compound that can make dogs sick. Ripe red tomatoes are much safer — the solanine levels drop significantly as tomatoes ripen — but the plant itself remains a hazard. If your dog has chewed on tomato plant leaves or stems, or eaten unripe tomatoes, watch for signs of poisoning over the next few hours.
The severity depends on how much your dog ate and their size. A small dog that ate a few leaves may show mild symptoms, while a larger dog might need veterinary care. The good news is that tomato plant poisoning is rarely fatal, but it is uncomfortable for your dog and worth preventing.
Key Takeaways
- Tomato plant stems, leaves, and unripe green tomatoes contain solanine, which is toxic to dogs in significant amounts.
- Ripe red tomatoes are safer than the plant itself, though moderation is still wise since tomatoes are acidic and high in sugar.
- Symptoms of tomato plant poisoning include vomiting, diarrhea, drooling, lethargy, and loss of appetite, usually appearing within a few hours of ingestion.
- Contact your veterinarian or poison control if your dog ate tomato plant material and shows any symptoms, or if you are unsure how much was consumed.
- The best prevention is keeping tomato plants out of reach — either in a fenced garden area, on a high shelf, or indoors away from your dog.
Which parts of the tomato plant are most dangerous
The stems and leaves are the most toxic parts of a tomato plant. These contain the highest concentration of solanine and are what your dog is most likely to chew on if they have access to a plant. Even a dog that brushes against the plant and gets leaves stuck to their fur can ingest the toxin while grooming.
Unripe green tomatoes are also dangerous because they still have high solanine levels. Once a tomato turns red and fully ripens, the solanine breaks down significantly, making ripe tomatoes much safer. However, ripe tomatoes are still not ideal for dogs because they are acidic and contain natural sugars that can upset a dog's stomach or contribute to weight gain.
The roots and soil around tomato plants do not pose a direct poisoning risk, but if your dog digs up a plant, they will likely eat the leaves and stems in the process.
Symptoms of tomato plant poisoning in dogs
Symptoms usually appear within a few hours of your dog eating tomato plant material. The most common signs are vomiting and diarrhea. Your dog may also drool more than usual, seem unusually tired, or refuse to eat. Some dogs experience stomach pain, which may show as restlessness or a hunched posture.
In more severe cases, your dog might have tremors, a slower heart rate, or weakness in the hind legs. These symptoms are less common and usually only happen if your dog ate a large amount of plant material or is a very small breed.
Symptoms typically resolve within 24 hours once the plant material has passed through your dog's system, but that does not mean you should wait it out at home. Contact your veterinarian if your dog is vomiting repeatedly, has diarrhea lasting more than a few hours, or seems unusually unwell.
What to do if your dog ate tomato plant material
First, try to figure out what your dog ate and how much. Did they chew on a few leaves, or did they eat an entire plant? Was it green and unripe, or mostly ripe tomatoes? This information helps your veterinarian assess the risk. If you are not sure, err on the side of caution and call anyway.
Contact your veterinarian or the ASPCA Animal Poison Control Center at 888-426-4435 (there is a consultation fee). Have your dog's weight and the details of what they ate ready. The poison control center can tell you whether your dog needs to be seen or if monitoring at home is safe.
Do not induce vomiting unless a veterinarian or poison control tells you to. In some cases, vomiting can make things worse. Your veterinarian may recommend activated charcoal, IV fluids, or other supportive care depending on how much solanine your dog ingested and how they are responding.
Keeping tomato plants away from dogs
The simplest solution is to keep tomato plants where your dog cannot reach them. If you grow tomatoes in a backyard garden, fence off the garden area or use a gate that your dog cannot open. If you grow tomatoes indoors or on a patio, place them on a high shelf or table that your dog cannot jump onto or knock over.
Potted tomato plants are easier to move than in-ground plants, so consider growing them in containers you can bring inside or place in a dog-free zone during the growing season. Even a small tomato plant can be a hazard if your dog is curious or likes to chew on plants.
If your dog has a history of eating plants, supervise them outdoors and consider using a leash in areas where tomato plants are growing. Some dogs lose interest in plants if they have plenty of appropriate toys and chew items, so make sure your dog has other things to occupy their attention.
Ripe tomatoes versus tomato plant toxicity
Ripe red tomatoes are not toxic to dogs in the way that tomato plant leaves are. A small amount of ripe tomato will not poison your dog. However, ripe tomatoes are still not an ideal food for dogs because they are acidic and can upset the stomach, especially in dogs with sensitive digestion. They also contain natural sugars that add unnecessary calories.
If your dog accidentally eats a ripe tomato that fell off the plant, there is no need to panic. Watch for mild stomach upset like soft stool or reduced appetite, but serious poisoning is unlikely. If you want to give your dog tomato as a treat, a small piece of ripe tomato occasionally is generally safe, but it should not be a regular part of their diet.
Never give your dog unripe green tomatoes, tomato sauce with added salt or garlic, or tomato-based products. Stick to plain, ripe tomato if you choose to offer any at all, and keep portions very small.
Other plants in the tomato family that are also toxic
Tomato plants belong to the nightshade family, and several other common plants in this family are also toxic to dogs. Potato plants (especially the leaves and stems) contain solanine just like tomato plants do. Eggplant plants are similarly toxic. Even peppers — both the plant and the fruit — can cause stomach upset in dogs, though they are less toxic than tomatoes or potatoes.
If you grow any of these plants at home, explore the same prevention strategy: keep them out of your dog's reach. If your dog has access to a vegetable garden, make sure the entire garden is fenced off or supervised so your dog cannot nibble on any of the plants.
Frequently Asked Questions
Can a dog die from eating tomato plant leaves?
Death from tomato plant poisoning is very rare in dogs. Most cases resolve on their own within 24 hours. A very small dog that ate a large amount of plant material, or a dog with an underlying health condition, faces higher risk, but even then, death is uncommon. Contact your veterinarian if your dog shows severe symptoms like repeated vomiting, tremors, or difficulty breathing.
How much tomato plant does it take to poison a dog?
There is no exact amount because it depends on your dog's size, age, and health. A general rule is that solanine toxicity in dogs occurs at doses of 2 to 5 milligrams per kilogram of body weight. A small dog that ate a handful of leaves might show symptoms, while a large dog might need to eat much more. When in doubt, contact poison control with your dog's weight and what they ate.
Is tomato sauce safe for dogs?
Plain tomato sauce made from ripe tomatoes is less toxic than the plant itself, but most commercial tomato sauces contain added salt, garlic, or onions, which are harmful to dogs. Homemade tomato sauce without these ingredients is safer, but it is still acidic and not necessary for your dog's diet. It is best to avoid it.
What if my dog ate just one tomato leaf?
One leaf is unlikely to cause serious poisoning, especially if your dog is medium-sized or large. Monitor your dog for a few hours for mild symptoms like drooling or soft stool. If your dog shows no signs of illness after 4 to 6 hours, they are probably fine. If symptoms develop or you are worried, contact your veterinarian.
Can dogs eat cherry tomatoes?
Ripe cherry tomatoes are safer than tomato plant material, but they are still acidic and high in sugar. A small piece of ripe cherry tomato occasionally will not hurt most dogs, but they should not be a regular treat. Never give your dog unripe green cherry tomatoes, as they contain the same solanine as larger unripe tomatoes.