Yes, Ranger’s Button is toxic to dogs!
Dogs accidentally consuming the Ranger’s Button 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).
Ranger’s Button consumption is also toxic to Cats and Horses.
Toxic Principles Of Ranger’s Button: Furanocoumarins.
More Info About The Ranger’s Button Plant
Scientific Name: Sphenosciadium capitellatum
Family: Apiaceae.
Also known as: White Heads.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.