Leek

Leeks (spring onions) belong to the Allium family and are toxic to dogs – just like onions, garlic, and chives.

Why is leek toxic for dogs?

Leeks contain thiosulfates that damage red blood cells in dogs. The result is haemolytic anaemia: the red blood cells are destroyed, and oxygen transport in the body breaks down.

Even small amounts can be toxic with regular consumption or a single larger intake. Keep leeks and related plants completely away from your dog.

Symptoms of Leek Poisoning

Poisoning symptoms appear within hours to days:

• Vomiting and diarrhoea: Often the first signs after ingesting toxic substances.
• Weakness and lethargy: Energy levels drop due to the destruction of red blood cells.
• Pale gums: A sign of anaemia caused by the breakdown of blood cells.
• Rapid or shallow breathing: An attempt to compensate for lack of oxygen.
• Accelerated heartbeat: The heart tries to compensate for reduced oxygen transport.

What to do if your dog has eaten leek?

Contact your vet immediately – even if no symptoms are visible yet. Depending on the amount ingested and the dog’s body weight, the speed and severity of poisoning vary. At the veterinary clinic, measures such as inducing vomiting, administering activated charcoal, or supportive therapy can be initiated.

Untreated, leek poisoning can become life-threatening.

Cooked Leek or Processed Dishes

Cooking does not destroy thiosulfates. Cooked leeks remain toxic. Processed foods such as soups or stews with leeks, onions, or garlic are equally dangerous. Watch out for table scraps and inform family members and guests about the toxicity.

Safe Vegetable Alternatives

These vegetables are safe for dogs and nutrient-rich:

• Carrots: Rich in vitamin A, easily digestible.
• Pumpkin: Supports digestion, high in fibre.
• Zucchini: Low in calories, contains vitamins and minerals.
• Broccoli: In small amounts, a good source of fibre and vitamins.