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