Yes, Leek is toxic to dogs!
Dogs accidentally consuming the Leek 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).
Leek consumption is also toxic to Cats and Horses.
Toxic Principles Of Leek: N-propyl disulfide.
More Info About The Leek Plant
Scientific Name: Allium ampeloprasum
Family: Liliaceae.
Also known as: Elephant Garlic.
The answer is based on information found on The American Society for the Prevention of Cruelty to Animals (ASPCA) website.
