Yes, Greater Ammi is toxic to dogs!
Dogs accidentally consuming the Greater Ammi 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).
Greater Ammi consumption is also toxic to Cats and Horses.
Toxic Principles Of Greater Ammi: Insoluble calcium oxalates.
More Info About The Greater Ammi Plant
Scientific Name: Ammi majus
Family: Apiaceae.
Also known as: Bishop’s Weed, Queen Anne’s Lace.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.