Yes, Ceriman is toxic to dogs!
Dogs accidentally consuming the Ceriman 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).
Ceriman consumption is also toxic to Cats and Horses.
Toxic Principles Of Ceriman: Insoluble calcium oxalates.
More Info About The Ceriman Plant
Scientific Name: Monstera deliciosa
Family: Araceae.
Also known as: Cutleaf Philodendron, Hurricane Plant, Swiss Cheese Plant, Mexican Breadfruit.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.