Yes, Cape Jasmine is toxic to dogs!
Dogs accidentally consuming the Cape Jasmine 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).
Cape Jasmine consumption is also toxic to Cats and Horses.
Toxic Principles Of Cape Jasmine: Genioposide, Gardenoside.
More Info About The Cape Jasmine Plant
Scientific Name: Gardenia jasminoides
Family: Rubiaceae.
Also known as: Gardenia.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.