Yes, Figwort is toxic to dogs!
Dogs accidentally consuming the Figwort 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).
Figwort consumption is also toxic to Cats and Horses.
Toxic Principles Of Figwort: Protoanemonin (an irritant).
More Info About The Figwort Plant
Scientific Name: Ranunculus acris
Family: Ranunculaceae.
Also known as: Buttercup, Butter Cress, Burwort, Crowfoot burwort.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.