Yes, Primrose is toxic to dogs!
Dogs accidentally consuming the Primrose 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).
Primrose consumption is also toxic to Cats and Horses.
Toxic Principles Of Primrose: Unknown.
More Info About The Primrose Plant
Scientific Name: Primula vulgaris
Family: Primulaceae.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.