Yes, Jerusalem Oak is toxic to dogs!
Dogs accidentally consuming the Jerusalem Oak 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).
Jerusalem Oak consumption is also toxic to Cats.
Toxic Principles Of Jerusalem Oak: Sesquiterpene lactones.
More Info About The Jerusalem Oak Plant
Scientific Name: Ambrosia mexicana
Family: Chenopodiaceae.
Also known as: Feather Geranium, Ambrosia Mexicana.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.