Leeks are highly toxic to dogs and belong to the allium family, like onions and garlic. They contain thiosulfates, compounds that damage red blood cells and cause haemolytic anaemia. Even small amounts are dangerous, and ingestion requires immediate veterinary treatment. Symptoms include lethargy, weakness, pale gums, dark urine, vomiting, and collapse, often appearing 24-48 hours after consumption. The toxin accumulates in the body, meaning repeated exposure is especially hazardous. All plant parts are toxic, including the white bulb and green tops. Keep leeks and dishes containing leeks completely away from dogs. If ingestion occurs, contact your vet or emergency clinic immediately, providing the amount consumed and time. Early treatment significantly improves prognosis.
Why Leeks Is Dangerous
Same family as onions/garlic. Toxic to red blood cells.
What To Do If Your Dog Eats Leeks
This is a veterinary emergency. Call your vet or the Animal Poison Line (01202 509000) immediately. Note how much your dog ate and when.
Use the Emergency Risk ToolCommon Mistakes
Watch out: Owners assume green vegetables are inherently safe for dogs. Some don't recognize leeks as dangerous. Others underestimate toxicity or delay seeking help. Some may not realize home cooking with leeks poses risk if residue remains.
Frequently Asked Questions
Are all parts of the leek toxic?
Yes; bulb, stem, leaves all contain thiosulfates; no part is safe.
How quickly do symptoms appear?
Usually 24-48 hours after ingestion; some dogs show signs within hours.
What does leek toxicity do?
Damages red blood cells, causing haemolytic anaemia, weakness, organ failure.
Is there treatment?
Early vet care with supportive treatment improves prognosis; monitor for complications.
How much is dangerous?
Even small amounts are hazardous; no safe dose exists. Seek immediate help.