Yes, Black Calla is toxic to dogs!
Dogs accidentally consuming the Black Calla 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).
Black Calla consumption is also toxic to Cats and Horses.
Toxic Principles Of Black Calla: Insoluble calcium oxalates.
More Info About The Black Calla Plant
Scientific Name: Arum palestinum
Family: Araceae.
Also known as: Solomon’s Lily, Wild Calla, Wild Arum.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.