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