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