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Tomato Plant Poisoning in Dogs: Solanine Signs, Treatment, Prognosis

PawAI Lab
7 min read

Learn how solanine and tomatine from tomato plants may affect dogs, what gastrointestinal and neurological signs to watch for, and the treatment and prognosis a veterinarian may discuss with you.

Quick Answer

Tomato plant poisoning in dogs is caused by glycoalkaloids called solanine and tomatine, which are concentrated in the leaves, stems, and green, unripe fruit. These compounds can irritate the digestive tract and, at higher levels, may affect the nervous system, causing vomiting, diarrhea, weakness, and unsteadiness. Ripe red tomatoes are generally considered safe in small amounts. If your dog has eaten a meaningful amount of green plant parts, contact a veterinarian or an animal poison-control service, 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) is a member of the nightshade family. Its leaves, stems, and green, unripe fruit contain two related glycoalkaloids, solanine and tomatine. These compounds can irritate the lining of the digestive tract and, at higher levels, may interfere with the nervous system's normal signaling.

Ripe red tomatoes contain only very small amounts of solanine and tomatine and are generally considered safe for dogs in moderation. The risk arises mainly when a dog chews the green parts of the plant or eats unripe fruit. Because the concentration of these compounds 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?

Signs of tomato plant poisoning in dogs most often affect the digestive system and typically appear within a few hours of ingestion. 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, the glycoalkaloids may affect the nervous system, and neurological signs may appear:

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

Most exposures to small amounts of the green parts result in mild signs. Severe poisoning is uncommon but is more likely when a dog consumes a large quantity of leaves, stems, or green fruit. 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.

Treatment and Prognosis

A veterinarian determines treatment based on the part of the plant consumed, the estimated amount, the time since exposure, and the dog's condition. Treatment is generally supportive and may include fluids to prevent dehydration, medication to control vomiting, and monitoring of the dog's vital signs and neurological status. In most cases, decontamination is only considered under direct veterinary direction.

The prognosis for tomato plant poisoning in dogs is generally good. Most exposures result in mild, self-limiting gastrointestinal signs that resolve with supportive care. Serious outcomes are uncommon and tend to occur only after ingestion of large amounts of green plant parts. A veterinarian can provide guidance specific to your dog's situation.

FAQ

How do solanine and tomatine affect a dog?

Solanine and tomatine are glycoalkaloids that can irritate the digestive tract lining and, at higher levels, interfere with normal nervous system signaling. This is why signs often begin with vomiting and diarrhea and, in larger amounts, may progress to weakness and unsteadiness.

Can a dog recover from tomato plant poisoning?

Yes, most dogs recover well. The majority of exposures cause mild gastrointestinal signs that resolve with supportive care. Serious outcomes are uncommon and are typically associated with ingestion of large quantities of leaves, stems, or green fruit.

Are ripe tomatoes safe for dogs to eat?

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

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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.

Written by PawAI Lab