Yes, Kiss-me-quick is toxic to dogs!
Dogs accidentally consuming the Kiss-me-quick 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).
Kiss-me-quick consumption is also toxic to Cats and Horses.
Toxic Principles Of Kiss-me-quick: Brunfelsamidine.
More Info About The Kiss-me-quick Plant
Scientific Name: Brunfelsia species
Family: Solanaceae.
Also known as: Yesterday, Today, Tomorrow, Lady-of-the-Night, Morning-Noon-and-Night, Fransiscan Rain Tree.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.