Yes, Andromeda Japonica is toxic to dogs!
Dogs accidentally consuming the Andromeda Japonica 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).
Andromeda Japonica consumption is also toxic to Cats and Horses.
Toxic Principles Of Andromeda Japonica: Grayanotoxins.
More Info About The Andromeda Japonica Plant
Scientific Name: Pieris japonica
Family: Ericaceae.
Also known as: Pieris, Lily-of-the-Valley Bush.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.