Can Dogs Eat Leeks?
No. Leeks belong to the Allium family, like onions and garlic, and contain the same compounds that damage a dog's red blood cells, even when cooked or blended into soup.
Why it's dangerous
Leeks contain the same sulfur compounds as onions (thiosulfates and disulfides), although slightly less concentrated. They oxidize red blood cells and can cause hemolytic anemia, and heat doesn't destroy them. A milder taste doesn't make them any safer for your dog.
The practical problem is that leeks are often eaten in quantity: a pot of potato leek soup, a vichyssoise, a broth or a quiche can contain several leeks, and it's easy to share a whole bowl without thinking. The same goes for the rest of the family: scallions (green onions), shallots, chives and ramps. As with onion, the damage adds up with small repeated amounts.
Is any amount safe?
There's no safe or recommended amount. If you're looking for a mild vegetable for your dog's food, zucchini, pumpkin or green beans do the same job with no risk.
Risks
- Hemolytic anemia, just like onion
- Soups, broths, quiches and casseroles with leeks
- The whole family: scallions, shallots, chives, ramps
- Cumulative effect from repeated leftovers
Frequently asked questions
Can my dog eat potato leek soup?
No. The toxic compounds in leeks stay in the soup even when it's blended and cooked, and a serving can contain quite a lot of leek, often with onion as well. If you want to share a soup with your dog, make a separate one with cooked pumpkin, zucchini or carrot, with no salt and nothing from the onion family.
Are leeks as toxic as onions?
Gram for gram they're a bit less potent than onion and much less than garlic, but they act the same way: they damage red blood cells and the effect builds up. Because leeks are eaten in large amounts in soups and stews, the real risk can be similar. Treat them like onion: keep them off your dog's plate.
General information reviewed against veterinary sources. If your dog has eaten something that worries you, call your vet or a 24-hour emergency vet right away, without waiting for symptoms.