Why is it dangerous to pets?
Oleander contains oleandrin and other cardiac glycosides — the same class of compound as foxglove and digoxin. They disrupt the sodium-potassium pump in heart muscle and can cause fatal rhythm disturbances.
Dried leaves stay toxic for a long time, and a pet that drinks from a vase of oleander can be poisoned without eating any leaf at all.
Why speed matters
Delaying care significantly worsens outcomes. Some signs appear hours or days later, so "looks fine right now" is not a reason to wait.
Symptoms of oleander poisoning
- Vomiting, drooling, abdominal pain, diarrhoea
- Slow or irregular heartbeat, weak pulse
- Weakness, wobbliness, fainting
- Pale or bluish gums, cold limbs
- Seizures and sudden collapse in severe cases
What to do right now
- Go to an emergency vet immediately — cardiac glycoside poisoning needs monitoring and can kill within hours.
- Do not wait for symptoms. Tell the vet the plant name and how much was eaten or drunk.
- Do not induce vomiting unless instructed.
- Remove oleander from any garden or yard a pet has access to, and never leave cuttings within reach.
If your pet shows any of the signs above, go to the nearest emergency vet now and call ahead.
Sources & further reading
- ASPCA Animal Poison Control — pet poison database & dosage references
- Pet Poison Helpline — toxicology triage guidelines
- Merck Veterinary Manual — toxicology monographs
- Vets Now (UK) — emergency toxicosis guidance