My dog ate oleander — what do I do?

Signs to watch for

• Vomiting, sometimes severe (often the first sign within 1–4 hours)
• Drooling, abdominal pain
• Diarrhea, sometimes bloody
• Slow, fast, or irregular heart rate (the dangerous sign)
• Weakness, lethargy, depression
• Tremors, ataxia (uncoordinated walking)
• Collapse
• Cardiac arrest (severe cases — can occur with little warning)

Timeline

Why oleander is so dangerous

Oleander contains multiple cardiac glycosides — oleandrin is the best known — that block the Na+/K+ ATPase pump in heart muscle cells. The result is increased intracellular calcium, hyperexcitable heart muscle, and unpredictable arrhythmias. The mechanism is the same as the human medication digoxin (derived from foxglove), which is why oleander cases are sometimes managed with the digoxin-specific antidote (Digibind / digoxin immune Fab).

All parts of the plant are toxic, and the toxicity does not decrease with drying — dead oleander leaves on the ground are still dangerous, sometimes more so as the plant material concentrates. Smoke from burning oleander is also toxic; never burn oleander trimmings.

Oleander is hardy in USDA zones 8–11 and common as ornamental landscaping in California, Texas, Florida, Arizona, and the Gulf states. It is often planted along highways and as privacy hedges. The flowers are showy (white, pink, red, salmon) and attract dogs to investigate.

What to do right now

1. Call your vet or the ASPCA Animal Poison Control ((888) 426-4435, 24/7) immediately. Oleander is in the highest-acuity plant category — same response urgency as sago palm or chocolate at toxic dose.

2. Bring a sample of the plant. A leaf or stem in a sealed bag confirms identification. Photograph the plant in situ too — flower color and growth pattern help botanical confirmation.

3. Do not induce vomiting at home unless your vet specifically tells you to. The cardiac instability can be worsened by the stress of at-home emesis.

4. Note how long ago the ingestion happened. The 2-hour decontamination window is a hard cutoff for some interventions — vets can do more before symptoms develop than after.

5. Drive to an emergency hospital with cardiac monitoring capability. General-practice vets can stabilize but severe oleander cases need ECG monitoring and access to cardiac medications (atropine, anti-arrhythmics) that not all clinics carry.

What the vet will do

Initial: ECG immediately, baseline bloodwork including electrolytes (especially potassium — cardiac glycosides shift potassium dynamics), and kidney function. Physical exam for current cardiovascular status.

Decontamination if early: induced vomiting (apomorphine) within 2 hours of ingestion, then multiple doses of activated charcoal every 4–6 hours to interrupt enterohepatic recirculation.

Cardiac management: atropine for bradycardia, anti-arrhythmics (lidocaine, procainamide) for ventricular arrhythmias. In severe documented oleander cases, digoxin immune Fab (Digibind) has been used off-label as a specific antidote — expensive and not stocked at most clinics but a real option in life-threatening cases.

Supportive: IV fluids, monitoring of potassium (cardiac glycoside toxicity often pushes potassium high), continuous ECG, hospitalization typically 48–72 hours for symptomatic cases.

What not to do

• Do not wait for symptoms — by the time arrhythmia is owner-visible, cardiac instability is established and harder to manage.
• Do not burn oleander trimmings. Smoke is toxic — to dogs, cats, and humans. Bag and dispose in regular trash.
• Do not assume dried fallen leaves are safe. Dried oleander retains its toxicity; some sources suggest concentration may actually increase.
• Do not handle oleander with bare hands when removing from yards — the sap is a skin irritant for humans. Wear gloves.
• Do not plant oleander in a yard with dogs unless completely fenced off. Curious dogs will eventually investigate.

Frequently asked