Yes, Gold Dieffenbachia is toxic to dogs!
Dogs accidentally consuming the Gold Dieffenbachia 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).
Gold Dieffenbachia consumption is also toxic to Cats.
Toxic Principles Of Gold Dieffenbachia: Insoluble calcium oxalates.
More Info About The Gold Dieffenbachia Plant
Scientific Name: Dieffenbachia picta
Family: Araceae.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.