Yes, Lemon Grass is toxic to dogs!
Dogs accidentally consuming the Lemon Grass 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).
Lemon Grass consumption is also toxic to Cats and Horses.
Toxic Principles Of Lemon Grass: Essential oils, cyanogenic glycosides.
More Info About The Lemon Grass Plant
Scientific Name: Cymbopogon citratus
Family: Poaceae.
Also known as: Oil Grass.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.