Yes, Black Laurel is toxic to dogs!
Dogs accidentally consuming the Black Laurel 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).
Black Laurel consumption is also toxic to Cats and Horses.
Toxic Principles Of Black Laurel: Grayanotoxins.
More Info About The Black Laurel Plant
Scientific Name: Leucothoe spp.
Family: Ericaceae.
Also known as: Dog Hobble, Dog Laurel, Fetter Bush, Sierra Laurel.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.