Azalea
DangerousAzaleas and rhododendrons are toxic to dogs.
Toxicity Level
9/10Why It's Dangerous
Contains grayanotoxins that affect the heart and nervous system. Even a few leaves can be dangerous.
The Science
GrayanotoxinsAzaleas and rhododendrons contain grayanotoxins (andromedotoxins), which bind to sodium channels in cell membranes and keep them in an open state. This prevents the cells from properly repolarizing, affecting the heart, skeletal muscles, and nervous system. Even small amounts of any part of the plant — leaves, flowers, nectar, or pollen — can cause symptoms. Historically, grayanotoxin poisoning from rhododendron honey has been documented since ancient Greece ("mad honey disease").
Sources
- •ASPCA Animal Poison Control Center
- •Merck Veterinary Manual — Rhododendron/Azalea Toxicosis
- •Toxicon Journal
Dosage & Thresholds
Ingestion of 0.2% of body weight in azalea leaves can cause symptoms. For a 10kg dog, that is approximately 20g of leaves — just a few leaves. All parts of the plant are toxic, with leaves containing the highest concentration. Symptoms typically appear within 2-6 hours: drooling, vomiting, diarrhea, weakness, and potentially cardiac arrhythmias.
Symptoms to Watch For
If your dog has ingested azalea
Contact your veterinarian or an emergency animal poison hotline immediately. Do not induce vomiting unless instructed by a vet.
callFind Emergency Vet