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