Yes, Roman Chamomile is toxic to dogs!
Dogs accidentally consuming the Roman Chamomile 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).
Roman Chamomile consumption is also toxic to Cats and Horses.
Toxic Principles Of Roman Chamomile: Volatile oil; bisabolol, chamazulene, anthemic acid, tannic acid.
More Info About The Roman Chamomile Plant
Scientific Name: Anthemis nobilis
Family: Asteraceae.
Also known as: Chamomile, Garden Chamomile, Ground Apple.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.