Is it true that rhododendrons are deadly to dogs?

Some deadly plants include:





Common Toxic Plants: Cardiotoxic plants: (effect the heart)





Convallaria majalis - Lily of the Valley


Nerium oleander - Oleander


Rhododendron species - Rhododendron, Azalea and Rosebay


Taxus species - American, Japanese, English and Western Yew


Digitalis purpurea - Foxglove


Kalanchoe spp. Kalanchoe





Plants that could cause kidney failure:





Certain species of lilies (dangerous to Cats)


Rhubarb (the leaves)


Grapes





Plants that could cause liver failure:





Cycads


Mushrooms





Plants that could cause multiple effects:





Autumn Crocus -- Hemorrhagic gastroenteritis, renal, liver damage and bone marrow suppression


Castor Bean -- Can cause renal failure, convulsions and death

Is it true that rhododendrons are deadly to dogs?
to all animals, including people. (Fatal. Produces nausea and vomiting, depression, difficult breathing, prostration and coma.)