Yes, Easter Rose is toxic to dogs!
Dogs accidentally consuming the Easter Rose 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).
Easter Rose consumption is also toxic to Cats and Horses.
Toxic Principles Of Easter Rose: Bufadienolides, glycosides, veratrin and prtoanemonin.
More Info About The Easter Rose Plant
Scientific Name: Helleborus niger
Family: Ranunculaceae.
Also known as: Hellebore, Christmas Rose, Lenten Rose.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.
