Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My dog ate Yellow Oleander - what should I do?
Thevetia peruviana
Potentially toxic
Contact your veterinarian or an animal poison-control resource now, especially if any amount was chewed or swallowed.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Signs to watch for
Vomiting, abdominal pain, lethargy, irregular heartbeat, and weakness.
Escalation note
The cardiac glycosides in this plant can cause life-threatening heart rhythm abnormalities. Immediate veterinary intervention is required if your dog has chewed or swallowed any part of this plant.
First aid at home
Take any plant material (or a clear photo) with you to the clinic to confirm identification. Do not induce vomiting at home and do not give activated charcoal without veterinary instruction — call ASPCA APCC (888-426-4435) or Pet Poison Helpline (855-764-7661) and follow their guidance while you transport your dog.
What to watch for
Earliest signs are vomiting, drooling, and diarrhea, often within an hour. Cardiac signs follow: a slow or irregular heartbeat, weakness or wobbliness, cold limbs, and lethargy. Severe cases progress to collapse and sudden death from heart-rhythm failure.
Time window
Gastrointestinal signs typically appear within 1–2 hours; cardiac arrhythmias can follow within hours and persist for 24+ hours, requiring inpatient ECG monitoring. Sudden death has been reported within hours of ingestion in serious cases.
When to call the vet
Call immediately — any ingestion is an emergency. Get to an ER vet right now and phone the ASPCA APCC (888-426-4435) or Pet Poison Helpline (855-764-7661) en route. Do not wait for cardiac symptoms; once arrhythmias appear, the window for intervention narrows quickly.
What this means for your dog
For dogs, yellow oleander is one of the most dangerous garden plants. Every part of the plant contains cardenolide cardiac glycosides that inhibit the sodium/potassium pump in heart muscle, causing potentially fatal arrhythmias even from small ingestions. Dogs that chew on fallen leaves, seeds, or yard clippings are at immediate risk.
Sources: ASPCA.
Source references
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.