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