Yes, Iron Cross Begonia is toxic to dogs!
Dogs accidentally consuming the Iron Cross Begonia 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).
Iron Cross Begonia consumption is also toxic to Cats and Horses.
Toxic Principles Of Iron Cross Begonia: Soluble calcium oxalates.
More Info About The Iron Cross Begonia Plant
Scientific Name: Begonia masoniana
Family: .
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.