PawAI LabPawAI LabTry it Free

Is Lantana Toxic to Dogs? Liver Risk, Signs, and What to Do

PawAI Lab
8 min read

Learn how the triterpenoids in lantana can affect a dog's liver, why unripe berries are particularly hazardous, what signs of poisoning to watch for, and what steps to take after exposure.

Quick Answer

Yes, lantana is toxic to dogs. It contains triterpenoids, primarily lantadene A and lantadene B, which can damage the liver. The unripe (green) berries are the most toxic part of the plant, though the leaves are also hazardous. Signs may include vomiting, diarrhea, weakness, jaundice, and in some cases, photosensitization (sunburn-like skin reactions on light-colored areas). If your dog has eaten lantana, contact a veterinarian or animal poison-control service immediately, even if no signs have appeared yet.

Before using any tool, contact a veterinary professional if your dog may have eaten any part of a lantana plant.

  • 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

Toxic. Lantana (Lantana camara and related species) is a widely grown ornamental shrub that contains triterpenoid compounds, most notably lantadene A and lantadene B. These substances are hepatotoxic, meaning they can injure the liver. The liver plays a central role in filtering toxins from the blood, producing bile for digestion, and metabolizing medications, so liver damage can have wide-ranging effects on a dog's health.

The unripe (green) berries are the most toxic part of the plant because they contain the highest concentration of lantadenes. The leaves are also toxic, particularly when consumed in quantity. Ripe (black or dark purple) berries are considered less toxic than unripe ones, though ingestion is still not safe. All parts of the plant should be regarded as potentially hazardous.

Because liver damage can develop even after moderate ingestions, lantana is considered a seriously toxic plant for dogs, and any consumption warrants professional veterinary assessment.

What Should the Owner Do Now?

  1. Contact a veterinarian or animal poison-control service immediately. Because lantana can damage the liver, early intervention is important.
  2. Remove any remaining plant material from your dog's mouth if it is safe to do so, and prevent further access to the plant.
  3. Do not induce vomiting unless a veterinarian or poison-control professional directly instructs you to do so.
  4. Do not give food, milk, salt, charcoal, or any home remedy. These are not proven treatments and may complicate veterinary care.
  5. Collect relevant information (see the section below) so the veterinary team can assess the situation accurately.
  6. Follow the veterinarian's instructions regarding whether to bring your dog in for blood work, liver function testing, decontamination, or supportive care.

Even if your dog ate only a small amount and appears well, professional consultation is essential because liver damage may not produce visible signs for hours or even days after exposure.

What Signs May Occur?

Signs of lantana poisoning in dogs may develop within 2 to 6 hours of ingestion for gastrointestinal effects, though liver-related signs can take longer to appear, sometimes over a period of one to several days.

Early gastrointestinal signs may include:

  • Vomiting
  • Diarrhea (which may become severe)
  • Excessive drooling
  • Reduced appetite
  • Abdominal discomfort

As liver function is affected, additional signs may emerge:

  • Weakness or lethargy
  • Jaundice (yellowing of the gums, whites of the eyes, or skin)
  • Increased thirst and urination
  • Photosensitization (redness, swelling, or blistering on light-colored or hairless skin exposed to sunlight)

Photosensitization occurs because liver damage can impair the normal breakdown of chlorophyll-related compounds in the digestive tract. When these compounds accumulate in the blood and reach the skin, sunlight can trigger an inflammatory reaction. This sign is most visible on areas with light-colored fur or thin hair, such as the nose, ears, belly, and around the eyes.

The absence of early signs does not necessarily rule out risk. Some dogs may not vomit immediately even when a toxic amount has been ingested, and liver damage can progress silently before becoming clinically apparent.

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
  • Plant part consumed: unripe berries, ripe berries, leaves, stems, or a combination
  • Plant identification: whether the plant is confirmed as lantana and the species if known (e.g., Lantana camara)
  • Estimated amount: best guess of how much plant material was eaten
  • Time of ingestion: when the exposure occurred, or the window during which it may have happened
  • Current symptoms: any vomiting, diarrhea, drooling, weakness, jaundice, or skin changes
  • Medical history: any pre-existing liver disease, current medications, or other health conditions

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

Differences That May Affect Risk

Several factors may influence how a dog responds to lantana exposure, though none allow for a reliable prediction of outcome:

  • Part of the plant: Unripe (green) berries contain the highest concentration of lantadenes and are the most hazardous. Leaves are also toxic. Ripe berries are considered less toxic but are still not safe for consumption.
  • Amount ingested: Larger ingestions are more likely to produce clinically significant liver damage, though individual sensitivity means that even moderate amounts can be important.
  • Body size: Smaller dogs may be at greater risk from a given amount, but liver toxicity has been documented across various sizes and breeds.
  • Pre-existing conditions: Dogs with existing liver disease or other chronic health conditions may be more vulnerable to additional liver injury.
  • Sunlight exposure: Dogs that spend significant time in direct sunlight after ingestion may be more likely to develop photosensitization if liver damage occurs, particularly those with light-colored coats or skin.
  • Individual sensitivity: Some dogs may react more strongly than others to similar exposures for reasons that are not fully understood.

Because of these variables, any known or suspected ingestion should be treated as potentially serious and discussed with a veterinary professional.

When to Contact a Veterinarian

Contact a veterinarian or animal poison-control service immediately if your dog has eaten any part of a lantana plant. Do not wait for symptoms to appear.

Emergency signs that require urgent veterinary attention include:

  • Persistent vomiting or diarrhea
  • Weakness, lethargy, or collapse
  • Yellowing of the gums, eyes, or skin (jaundice)
  • Redness, swelling, or blistering on light-colored skin areas
  • Changes in drinking or urination
  • Refusal to eat
  • Signs of abdominal pain (restlessness, hunched posture)

Non-urgent follow-up: If the ingestion occurred hours or days ago and your dog appears normal, a veterinary examination is still strongly recommended. Blood work to assess liver enzyme levels can detect liver damage even before visible signs develop.

FAQ

Which part of lantana is most toxic to dogs?

The unripe (green) berries are the most toxic part of the lantana plant because they contain the highest concentration of lantadene A and lantadene B. The leaves are also toxic. Ripe (dark) berries are considered less toxic but are still not safe for dogs to eat. All parts of the plant should be kept out of reach.

Can lantana cause liver damage in dogs?

Yes. The triterpenoids in lantana, particularly lantadene A and B, are hepatotoxic, meaning they can injure the liver. Liver damage may not produce visible signs immediately, which is why blood work to assess liver enzymes is often recommended after known ingestion. A veterinarian can evaluate liver function and determine whether treatment is needed.

What is photosensitization in dogs?

Photosensitization is a skin reaction that can occur when liver damage allows certain light-sensitive compounds to accumulate in the blood. When these compounds reach the skin and are exposed to sunlight, they trigger inflammation, redness, swelling, and sometimes blistering, typically on light-colored or hairless areas. It is a known complication of lantana poisoning in dogs and requires veterinary attention.

TOXICITY CHECKER

Not sure whether another plant in your home or garden may be risky for your dog? 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.

Written by PawAI Lab