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How Toxic Are Hydrangeas to Pets?

By Pamela Gardapee ; Updated September 21, 2017

Hydrangea plants are toxic to horses, dogs and cats. The principle toxin is cyanogenic glycoside. The pet can experience gastrointestinal upset as well as diarrhea, depression and vomiting. In rare cases, pets can experience cyanide intoxication.


About the Author


Pamela Gardapee is a writer with more than seven years experience writing Web content. Being functional in finances, home projects and computers has allowed Gardapee to give her readers valuable information. She studied accounting, computers and writing before offering her tax, computer and writing services to others.