Yes, Fire Lily is toxic to dogs!
Dogs accidentally consuming the Fire Lily 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).
Fire Lily consumption is also toxic to Cats.
Toxic Principles Of Fire Lily: Lycorine and other alkaloids.
More Info About The Fire Lily Plant
Scientific Name: Hippeastrum spp.
Family: Amaryllidaceae.
Also known as: Amaryllis, Barbados Lily, Lily of the Palace, Ridderstjerne.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.