Is Oleander Toxic to Dogs? Signs and What to Do

Name: Is Oleander Toxic to Dogs? Signs and What to Do
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Yes, oleander is toxic to dogs, and every part of the plant is dangerous. Even a small amount of leaf, flower, or stem can cause serious heart problems, and this is always an emergency. If you think your dog ate any part of an oleander plant, call a veterinarian or poison control right away.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Oleander (Nerium oleander) is toxic to dogs, cats, and horses, and the toxic principle is cardiac glycosides [1].
All parts of the plant are poisonous, including leaves, flowers, stems, and any water a cut stem sits in.
Signs can start within minutes to a few hours and include drooling, abdominal pain, diarrhea, depression, and heart rhythm problems [1].
Call your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661 immediately.
Do not make your dog vomit unless a veterinarian tells you to.

Is Oleander Toxic to Dogs?

Yes. Oleander is listed as toxic to dogs, cats, and horses by the ASPCA Animal Poison Control Center, with cardiac glycosides as the toxic principle [1]. The plant's scientific name is Nerium oleander, and it also goes by common names like rose-bay [1]. It belongs to the Apocynaceae family, a group that includes several other well-known poisonous plants.

This is not a plant where a little nibble is harmless. Oleander poisoning can be fatal, and it has killed animals across multiple species, including cattle, geese, and horses [2][3][4]. In one cattle farm case, all six resident animals died after exposure [2]. In a group of geese, death came within 15 to 90 minutes of eating oleander clippings [3]. Dogs are smaller than cattle, so the margin for error is even thinner.

If you want a broader list of plants to avoid, see Plants Poisonous To Dogs.

Is White Oleander Toxic to Dogs?

Yes. White oleander is the same species, Nerium oleander, so it carries the same cardiac glycosides and the same risk [1]. Flower color does not change toxicity. A white-flowering shrub in your yard is just as dangerous as a red or pink one.

Is Pink Oleander Poisonous to Dogs?

Yes. Pink oleander is also Nerium oleander and is toxic to dogs [1]. The same applies to red, yellow, and variegated varieties. Do not assume a particular color is safer.

Is Nerium Oleander Toxic to Dogs?

Yes. Nerium oleander is the scientific name for the plant, and it is toxic to dogs [1]. When you call poison control or your veterinarian, giving the scientific name helps them confirm the plant quickly.

Are Oleander Flowers Toxic to Dogs?

Yes. Oleander flowers are toxic, and so are the leaves, stems, and roots. The ASPCA lists the whole plant as toxic with cardiac glycosides as the toxic principle [1]. Flowers often fall to the ground where dogs sniff and eat them, so fallen blooms are a real hazard. A dog may also drink water from a vase holding cut oleander stems, which can carry the toxins too.

Is Oleander Poisonous to Touch Dogs?

Touching oleander is not the main concern. The danger comes from eating the plant, not from brushing against it. That said, a dog who walks through clippings and then licks their paws could swallow plant material. Keep clippings, prunings, and yard waste out of reach, and wash your hands after handling the plant.

What Makes Oleander So Dangerous?

Oleander contains cardiac glycosides, a class of compounds called cardenolides that are toxic to many species, from people to insects [2]. The main active compound is oleandrin [2][3]. These compounds interfere with the heart's electrical system and can cause dangerous rhythm disturbances.

In a 2024 study, researchers gave beagle dogs an oleander leaf extract by mouth to find a safe dose. At 2.3 micrograms per kilogram of oleandrin, there were no observable adverse effects. Mild, reversible signs appeared only when doses exceeded 6.9 micrograms per kilogram. A dose greater than 460 micrograms per kilogram was fatal in one of two dogs [5]. That is a very narrow window between no effect and death, which is why any known ingestion is treated as an emergency.

The heart is not the only organ affected. Studies of oleander poisoning have found kidney lesions in multiple species, including horses, and geese showed both cardiac and kidney damage after eating the plant [6][3]. In dogs, severe oleander toxicosis has caused permanent heart rhythm problems from ischemic damage, meaning the heart muscle was starved of blood flow [7].

Signs of Oleander Poisoning in Dogs

Signs reflect what the toxins do to the heart, the gut, and the nervous system. The ASPCA lists drooling, abdominal pain, diarrhea, colic, depression, and death as clinical signs in animals exposed to oleander [1]. In cattle, common signs included severe depression, loss of appetite, rumen stasis, diarrhea, nasal discharge, fast heart rate, and irregular heartbeat [4].

What You Might See at Home

Drooling or excessive salivation
Vomiting or diarrhea
Abdominal pain (pacing, whining, a tucked belly, or refusing to be touched)
Weakness, wobbling, or collapse
Depression or unusual quietness
Fast, slow, or irregular heartbeat
Pale or blue-tinged gums
Tremors or seizures in severe cases

How Fast Do Signs Appear?

Timing varies with how much plant was eaten and how much oleandrin it contained. In geese, severe signs and death occurred within 15 to 90 minutes of eating oleander clippings [3]. In cattle, the first animal died within 48 hours of exposure [4]. For a dog, signs often begin within a few hours, but a large ingestion can cause collapse quickly. Do not wait for symptoms to appear before calling for help. If you saw your dog eat oleander, that is enough to act.

What to Do Right Now

Move your dog away from the plant. Pick up any remaining plant material so no one else eats it.
Call for help immediately. Contact your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661.
Tell them what you know. The plant name, which parts were eaten, roughly how much, and when it happened.
Do not induce vomiting unless a veterinarian tells you to. Making a dog vomit can be dangerous, especially with a plant that affects the heart.
Keep the plant material or a photo. Bring a sample or clear photos of the leaves, flowers, and stems so the plant can be identified.
Go to the clinic when told. Do not wait to see if signs develop.

If your dog ate something and you are not sure what it was, these first aid steps can help while you make calls: What to Do If Your Dog Ate Something Toxic: First Aid Steps. For a similar situation with a different plant, see My Dog Ate a Mushroom: How to Tell If It's Toxic.

How Veterinarians Treat Oleander Poisoning

Treatment depends on how sick your dog is and how recently they ate the plant. Your veterinarian will calculate any medication dose from your dog's weight and health, so there is no at-home dose to give.

Common steps include:

Decontamination. If the ingestion was recent and your dog is stable, the veterinarian may induce vomiting or give activated charcoal. This is a clinic decision, not a home one.
Supportive care. Intravenous fluids, medications to control nausea and diarrhea, and monitoring for heart rhythm changes.
Heart monitoring. An electrocardiogram lets the team watch for dangerous rhythms and treat them quickly.
Antiarrhythmic drugs. These are used to stabilize the heart when rhythms go wrong.
Digoxin-specific immune Fab. This antidote was used successfully in a dog with severe oleander toxicosis that did not respond to other antiarrhythmic therapies and supportive care [7]. The dog recovered but had ischemic injuries with unknown long-term effects [7].

Because oleander can cause kidney damage as well as heart damage, your veterinarian may also run blood work to check organ function [6][3].

Outlook After Oleander Exposure

The outlook depends on how much was eaten, how fast treatment started, and how the heart responds. Some dogs recover with aggressive care, as in the published case where digoxin-specific immune Fab helped a dog survive severe toxicosis [7]. Others do not survive, and oleander has caused death in dogs, cattle, geese, and horses [1][2][3][4].

Even dogs who survive may have lasting heart damage. The dog treated with immune Fab recovered but had ischemic injuries whose long-term effects were unknown [7]. That means follow-up visits and repeat heart checks may be needed. Ask your veterinarian what monitoring schedule makes sense for your dog.

Prevention and Safer Alternatives

The simplest prevention is to keep oleander out of your dog's world.

Remove oleander from your yard if you have a dog who chews plants, or fence it off completely.
Never compost oleander clippings where a dog can reach them.
Do not leave cut stems in water where a dog can drink.
Supervise your dog in yards and parks where oleander grows, especially in warm climates where it is common landscaping [2].
Train a "leave it" cue and reward your dog for ignoring plants.
Check new plants against a toxic plant list before you buy.

If you love the look of oleander, choose a nontoxic shrub instead. Your veterinarian or a local extension office can suggest safe options for your region. For more on which plants to avoid, see Plants Poisonous To Dogs. If you are also wondering about other common household risks, this article on allicin explains why some foods are dangerous too: Can Dogs Eat Garlic? Allicin Toxicity in Dogs.

Limitations and When to Contact a Veterinarian

This article cannot tell you whether your specific dog will be fine. Individual cases need a veterinarian who can examine your dog, run tests, and watch the heart.

Call emergency care now if your dog:

Was seen eating any part of an oleander plant
Is vomiting, drooling heavily, or has diarrhea
Is weak, wobbly, collapsing, or hard to wake
Has a fast, slow, or irregular heartbeat
Has pale, white, or blue gums
Is having tremors or a seizure

Call the same day if you are not sure whether your dog ate the plant but you found chewed leaves or missing clippings. Do not wait for signs. Oleander can move fast, and geese died within 15 to 90 minutes of eating it [3].

Schedule a routine visit if your dog had possible exposure in the past and seems normal now. Your veterinarian can check the heart and kidneys and decide whether monitoring is needed.

Frequently Asked Questions

How much oleander does it take to hurt a dog?

There is no safe amount you can judge at home. In a study of beagle dogs, mild signs appeared only above a certain oleandrin dose, and a much higher dose was fatal in one of two dogs [5]. Because leaf potency varies, any known ingestion should be treated as an emergency.

Can a dog survive oleander poisoning?

Yes, some dogs survive with aggressive veterinary care. A published case describes a dog with severe oleander toxicosis who recovered after treatment with digoxin-specific immune Fab when other therapies failed [7]. Survival depends on the amount eaten and how quickly treatment starts.

Will my dog get sick from just chewing an oleander leaf?

Possibly, and you should not assume one leaf is harmless. Oleander contains cardiac glycosides throughout the plant, and the ASPCA lists the plant as toxic to dogs [1]. Call poison control or your veterinarian and describe what happened.

Does oleander affect a dog's kidneys too?

It can. Studies have found kidney lesions in animals with oleander poisoning, including horses, and geese showed kidney damage along with heart damage after eating the plant [6][3]. Your veterinarian may check kidney values as part of treatment.

Should I make my dog throw up after eating oleander?

No, not unless a veterinarian tells you to. Inducing vomiting is a medical decision, and with a plant that affects the heart, it can do more harm than good. Call your veterinarian or a poison control hotline first and follow their instructions.

References

Toxic and Non-toxic Plants: Oleander. ASPCA Animal Poison Control Center.
A Probable Fatal Case of Oleander (Nerium oleander) Poisoning on a Cattle Farm: A New Method of Detection and Quantification of the Oleandrin Toxin in Rumen. Toxins, 2019.
Poisoning by Nerium oleander L. in Franconia Geese. Animals : an open access journal from MDPI, 2024.
Outbreak of Oleander (Nerium oleander) Poisoning in Dairy Cattle: Clinical and Food Safety Implications. Toxins, 2020.
Preliminary investigation of the safe dose of oleandrin when administered orally to Beagles. Journal of the American Veterinary Medical Association, 2024.
Renal Lesions in Horses with Oleander (Nerium oleander) Poisoning. Animals : an open access journal from MDPI, 2022.
Successful use of digoxin-specific immune Fab in the treatment of severe Nerium oleander toxicosis in a dog. Journal of veterinary emergency and critical care (San Antonio, Tex. : 2001), 2017.