Yes, Elephant Ears is toxic to dogs!
Dogs accidentally consuming the Elephant Ears 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).
Elephant Ears consumption is also toxic to Cats.
Toxic Principles Of Elephant Ears: Calcium oxalate crystals.
More Info About The Elephant Ears Plant
Scientific Name: Caladium hortulanum
Family: Araceae.
Also known as: Caladium, Taro, Pai, Ape, Cape, Via, Via sori, Malanga.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.