Yes, Desert Azalea is toxic to dogs!
Dogs accidentally consuming the Desert Azalea plants can show the following clinical symptoms: Vomiting, Prolonged Depression, Incoordination, Hypersalivaton, Sleepiness Or Excitation, Dilated Pupils, Low Body Temperature, Low Blood Pressure, Coma, Seizure And Death (In Rare Cases).
Desert Azalea consumption is also toxic to Cats and Horses.
Toxic Principles Of Desert Azalea: Cardiac glycosides.
More Info About The Desert Azalea Plant
Scientific Name: Adenium obesum
Family: Apocynaceae.
Also known as: Desert Rose, Mock Azalea, Sabi Star, Impala Lily, Kudu Lily.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.