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Is Tomato Plant Toxic to Dogs? Solanine and Tomatine Risks

PawAI Lab
7 min read

Learn which parts of a tomato plant may be harmful to dogs, why the ripe fruit is generally considered safe, and what to do if your dog has chewed the leaves, stems, or green tomatoes.

Quick Answer

Tomato plants are potentially harmful to dogs. The leaves, stems, and green, unripe fruit contain solanine and tomatine, compounds that can cause gastrointestinal and, in larger amounts, neurological signs. Ripe red tomatoes are generally considered safe for dogs in small quantities. If your dog has eaten a significant amount of tomato plant leaves, stems, or green fruit, contact a veterinarian or an animal poison-control service for guidance, even if your dog appears well at this time.

Before using any tool, contact a veterinary professional if your dog may have eaten tomato plant leaves, stems, or green fruit.

  • US: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • UK: Animal PoisonLine (01202 509000) or your nearest veterinary emergency clinic
  • Canada: ASPCA Animal Poison Control (888-426-4435) or Pet Poison Helpline (855-764-7661)
  • AU: Animal Emergency Centre or your regular vet
  • EU: Contact your nearest veterinary emergency service

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Safety Verdict

Potentially Harmful. The tomato plant (Solanum lycopersicum) belongs to the nightshade family. Its leaves, stems, and green, unripe fruit contain glycoalkaloids known as solanine and tomatine. These compounds can irritate the digestive tract and, at higher levels, may affect the nervous system.

Ripe red tomatoes contain only very small amounts of these compounds and are generally considered safe for dogs in moderation. The main concern is exposure to the green parts of the plant or to unripe fruit. Because the concentration of solanine and tomatine varies with the plant's maturity and the part consumed, no reliable safe amount of the green parts can be established.

What Should the Owner Do Now?

  1. Assess what was eaten. Ripe red fruit in small amounts usually does not require urgent action, but leaves, stems, or green tomatoes may warrant a call to a professional.
  2. Contact a veterinarian or animal poison-control service if your dog has eaten a meaningful amount of green plant parts or green fruit, or if you are unsure.
  3. Do not induce vomiting unless a veterinarian or poison-control professional directly instructs you to do so.
  4. Collect relevant information (see the section below) so the veterinary team can assess the situation accurately.
  5. Do not give food, milk, salt, charcoal, or any home remedy. These are not proven treatments and may worsen the situation.
  6. Follow the veterinarian's instructions regarding examination or supportive care.

What Signs May Occur?

When signs occur after ingestion of tomato plant leaves, stems, or green fruit, they most often affect the digestive system and appear within a few hours. Not all dogs show signs, and the absence of early symptoms does not necessarily rule out risk.

Gastrointestinal signs may include:

  • Vomiting
  • Diarrhea
  • Drooling or hypersalivation
  • Reduced appetite
  • Abdominal discomfort

With larger amounts, neurological signs may appear:

  • Lethargy or drowsiness
  • Weakness
  • Unsteady walking (ataxia)
  • Confusion or apparent disorientation
  • Dilated pupils

Most exposures to small amounts of the plant result in mild signs, but because individual responses vary, monitoring and professional guidance are recommended.

What Information Should Be Ready?

When you contact a veterinarian or poison-control service, having the following details available can help them assess the situation more efficiently:

  • Dog's details: species, breed, approximate age, and body weight
  • Part of plant consumed: leaves, stems, green unripe fruit, or ripe red fruit
  • Estimated amount: best guess of how much plant material or how many tomatoes were eaten
  • Time of ingestion: when the exposure occurred, or the window of time during which it may have happened
  • Current symptoms: any vomiting, diarrhea, drooling, lethargy, or unsteadiness
  • Growing conditions: whether the plant was from a garden, a store-bought plant, or treated with any pesticide or fertilizer
  • Medical history: any current medications or existing health conditions

Provide honest estimates rather than precise numbers. The veterinary team can work with approximate information to determine the best course of action.

Differences That May Affect Risk

Risk after tomato plant ingestion is influenced by several factors, none of which allow for a reliable prediction of outcome:

  • Part of plant: Leaves, stems, and green fruit contain more solanine and tomatine than ripe red fruit, which is generally considered safe in small amounts.
  • Ripeness: Unripe green tomatoes carry more risk than fully ripe red tomatoes.
  • Body size: Smaller dogs may be affected by smaller amounts of plant material, although risk is not determined by size alone.
  • Individual sensitivity: Responses vary between dogs, and prior health conditions may influence how the body handles the compounds.

Because of these uncertainties, ingestion of the green parts of the plant should be discussed with a veterinary professional when more than a small taste is involved.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service if your dog has eaten a meaningful amount of tomato plant leaves, stems, or green, unripe fruit.

Emergency signs that require urgent veterinary attention include:

  • Persistent vomiting or diarrhea
  • Profound weakness, collapse, or unresponsiveness
  • Seizures
  • Unsteady walking or confusion
  • Refusal to eat or drink

Non-urgent follow-up: If your dog ate only a small piece of ripe red tomato and appears normal, professional consultation may not be necessary, but you may still call for reassurance if you are concerned.

FAQ

Can dogs eat ripe tomatoes?

Ripe red tomatoes are generally considered safe for dogs in small amounts, because they contain only very small amounts of solanine and tomatine. They should be given plain, without added salt, sauces, or seasonings. Large quantities are not recommended.

Are tomato leaves and stems dangerous to dogs?

The leaves and stems contain higher levels of solanine and tomatine than ripe fruit and are considered potentially harmful. Eating a significant amount may cause gastrointestinal and, in larger amounts, neurological signs. Contact a veterinarian if your dog has chewed these parts.

What is tomatine?

Tomatine is a glycoalkaloid found in tomato plants, especially in the leaves, stems, and green, unripe fruit. It is related to solanine and can irritate the digestive tract and, at higher levels, affect the nervous system.

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Disclaimer

This article and the PawAI Toxicity Checker provide general safety information and cannot determine an individual pet's toxicity risk or replace a veterinarian or animal poison-control service. If exposure may have occurred, contact an appropriate professional promptly, even if your pet appears well.