Yes, Palm Lily is toxic to dogs!
Dogs accidentally consuming the Palm 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).
Palm Lily consumption is also toxic to Cats.
Toxic Principles Of Palm Lily: Saponins.
More Info About The Palm Lily Plant
Scientific Name: Cordyline australis
Family: Agavaceae.
Also known as: Giant Dracaena, Grass palm.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.