PawAI LabPawAI LabTry it Free

Green Tomatoes Poisoning in Dogs: Signs, Treatment, and Prognosis

PawAI Lab
8 min read

Understand how solanine and tomatine in green tomatoes and tomato plants can affect dogs, the clinical signs that may develop, how veterinarians approach treatment, and what prognosis owners can expect.

Quick Answer

Green tomatoes and the leaves, stems, and vines of the tomato plant contain glycoalkaloids called solanine and tomatine. These compounds can cause gastrointestinal and neurological toxicity in dogs. Signs may include vomiting, diarrhea, weakness, confusion, and dilated pupils. With prompt veterinary care, the prognosis is generally favorable, but any suspected ingestion should be discussed with a veterinarian or animal poison-control service without delay.

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

  • 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

TOXICITY CHECKER

Check the item and pet details for general, species-aware risk information while you contact a veterinary professional when needed.

Check an Item

Do not delay emergency veterinary or poison-control advice to use this tool.

Safety Verdict

Potentially Harmful. Green (unripe) tomatoes and the vegetative parts of the tomato plant (leaves, stems, and vines) contain higher concentrations of the glycoalkaloids solanine and tomatine than ripe red fruit. These compounds can disrupt cell membranes and affect the nervous system in dogs. Ripe red tomatoes contain only trace amounts and are generally considered non-toxic in moderation, but green tomatoes and plant material warrant caution.

The concentration of solanine and tomatine is highest in the leaves and stems, followed by green fruit. Because the precise toxic dose for dogs is not well established and individual responses vary, professional assessment is recommended after any significant ingestion.

What Should the Owner Do Now?

  1. Contact a veterinarian or animal poison-control service immediately. Early guidance can help determine whether decontamination, monitoring, or an examination is needed.
  2. Do not induce vomiting unless a veterinarian or poison-control professional directly instructs you to do so. Home methods can cause additional harm.
  3. Remove any remaining green tomatoes or plant parts from your dog's environment to prevent further ingestion.
  4. Do not administer food, milk, salt, oil, charcoal, or any home remedy. None of these are proven treatments for glycoalkaloid exposure.
  5. Gather relevant details about the ingestion to share with the veterinary team (see the section below).
  6. Follow professional instructions regarding whether to bring your dog in for evaluation or supportive care.

What Signs May Occur?

Green tomato poisoning in dogs may produce two categories of signs: gastrointestinal and neurological. Signs may appear within a few hours of ingestion, and severity often correlates with the amount and plant part consumed.

Gastrointestinal signs may include:

  • Vomiting
  • Diarrhea
  • Drooling or excessive salivation
  • Reduced appetite
  • Abdominal pain or discomfort

Neurological signs, which may indicate more significant exposure, can include:

  • Weakness or reluctance to move
  • Confusion or disorientation
  • Dilated pupils
  • Loss of coordination or unsteady gait
  • Depression or lethargy

In more severe cases, higher exposures may be associated with a slowed heart rate, breathing changes, and in rare instances, more serious neurological effects. The absence of early signs does not necessarily rule out risk, so monitoring should continue for several hours after ingestion.

How Solanine and Tomatine Affect Dogs

Solanine and tomatine are glycoalkaloids, naturally occurring compounds produced by members of the nightshade (Solanaceae) family, which includes tomatoes, potatoes, and eggplants. These substances help protect the plant from pests.

In dogs, these compounds can irritate the gastrointestinal lining, which may lead to vomiting and diarrhea. At higher exposures, they may also affect the nervous system by interfering with the normal transmission of nerve signals. This can produce the weakness, confusion, and coordination changes sometimes seen with more significant ingestions.

Ripe red tomatoes contain only very small amounts of solanine and tomatine, which is why they are generally considered safe for dogs in small quantities. The risk is concentrated in green fruit and in the leaves and stems of the plant.

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
  • Item consumed: green tomatoes, tomato leaves, stems, vines, or a combination
  • Estimated amount: best guess of the number of green tomatoes or the quantity of plant material ingested
  • Time of ingestion: when exposure occurred, or the window of time during which it may have happened
  • Current symptoms: any vomiting, diarrhea, weakness, confusion, dilated pupils, or coordination changes
  • Ripeness: whether the fruit was fully green or partially ripened
  • Medical history: any pre-existing gastrointestinal, neurological, or cardiac conditions, and current medications

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

Several factors influence how a dog may respond to green tomato ingestion:

  • Part of the plant: Leaves and stems contain the highest concentrations of solanine and tomatine, followed by green fruit. Ripe fruit contains the least.
  • Amount ingested: Larger ingestions are more likely to produce noticeable signs, though individual sensitivity also plays a role.
  • Body size: Smaller dogs may be more affected by a given amount, but risk is not limited to small breeds.
  • Age and health status: Very young, very old, or dogs with existing gastrointestinal, neurological, or cardiac conditions may be more vulnerable.
  • Individual sensitivity: Dogs may respond differently to similar exposures, and past reactions do not reliably predict future outcomes.

Because these variables interact in ways that cannot be precisely predicted, any significant ingestion should be treated as potentially concerning.

Treatment and Prognosis

Treatment for green tomato poisoning in dogs is primarily supportive and is directed by a veterinarian based on the severity of signs. Approaches may include:

  • Decontamination: If ingestion was recent and a veterinarian determines it is appropriate, decontamination measures may be considered. This should only be performed under professional guidance.
  • Gastrointestinal support: Medications to control vomiting and protect the gastrointestinal tract may be used as directed by the veterinarian.
  • Intravenous fluids: Fluid therapy may help support hydration and assist the body in eliminating the compounds.
  • Neurological monitoring: Dogs showing neurological signs may require closer observation and additional supportive care.

Prognosis is generally favorable when veterinary care is sought promptly and the ingestion involves moderate amounts. Most dogs recover with appropriate supportive care. Cases involving very large ingestions or delayed treatment may carry a more guarded outlook, particularly if significant neurological signs are present.

Owners should not attempt to treat green tomato poisoning at home, as inappropriate interventions can worsen the situation.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service if your dog has eaten green tomatoes or any part of a tomato plant.

Emergency signs that require urgent veterinary attention include:

  • Persistent or severe vomiting and diarrhea
  • Weakness, collapse, or marked lethargy
  • Confusion, disorientation, or loss of coordination
  • Dilated pupils or other unusual eye changes
  • Changes in breathing or heart rate

Non-urgent follow-up: If a small amount was consumed and your dog appears well, professional guidance is still recommended to confirm whether home monitoring is appropriate or whether an examination is advisable.

FAQ

Can dogs eat ripe red tomatoes?

Ripe red tomatoes contain only trace amounts of solanine and tomatine and are generally considered safe for dogs in small, plain portions. They should not include seasonings, oils, garlic, or onion, which may carry their own risks.

What is the difference between green and ripe tomato toxicity in dogs?

Green tomatoes and tomato plant parts contain significantly higher concentrations of solanine and tomatine than ripe red fruit. This is why green tomatoes and plant material pose a greater toxicity risk, while ripe fruit is generally considered safe in moderation.

What is the prognosis for green tomato poisoning in dogs?

The prognosis is generally favorable with prompt veterinary care and supportive treatment. Most dogs recover well, especially when care begins before severe neurological signs develop. Outcomes may be more guarded with very large ingestions or delayed treatment.

TOXICITY CHECKER

Concerned about another food or plant your dog may have encountered? Get general, species-aware safety information in seconds.

Open Toxicity Checker

This tool provides general safety information only and does not replace veterinary advice.

Sources

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.