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