Yes, Cycads is toxic to dogs!
Dogs accidentally consuming the Cycads 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).
Cycads consumption is also toxic to Cats and Horses.
Toxic Principles Of Cycads: Cycasin, B-methylamino-l-alanine, unidentified neurotoxin (cattle).
More Info About The Cycads Plant
Scientific Name: Cycas and Zamia species
Family: Cycadaceae.
Also known as: Sago Palm, Fern Palm.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.
