Yes, Seaside Daisy is toxic to dogs!
Dogs accidentally consuming the Seaside Daisy 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).
Seaside Daisy consumption is also toxic to Cats and Horses.
Toxic Principles Of Seaside Daisy: Unknown.
More Info About The Seaside Daisy Plant
Scientific Name: Erigeron speciosus
Family: Asteraceae.
Also known as: Showy Daisy, Horseweed, Fleabane.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.