Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
Leeks are toxic to dogs. They belong to the Allium family alongside onions, garlic, chives, and shallots. All parts of the leek plant contain organosulfur compounds that damage dogs' red blood cells, leading to haemolytic anaemia. While leeks may be slightly less concentrated than onions or garlic, they are still dangerous in any quantity. Symptoms of leek poisoning include vomiting, diarrhoea, abdominal pain, drooling, lethargy, pale gums, weakness, and dark or reddish urine. Symptoms may take several days to appear as the red blood cell damage accumulates. Both raw and cooked leeks are toxic. If your dog eats leeks, contact your veterinarian immediately.
What You Should Know
Leeks should be kept well away from dogs. If your dog has eaten leeks, watch for symptoms such as vomiting, diarrhea, lethargy, or loss of appetite. In an emergency, contact your veterinarian or an animal poison helpline straight away.