Can dogs eat leeks?
Short answer
No, leeks are toxic to dogs. They belong to the Allium family along with onions, garlic, and chives, and contain compounds that damage red blood cells and can cause hemolytic anemia. Raw or cooked, leeks are equally dangerous.
Leeks belong to the same family as onions and garlic and are toxic to dogs whether raw or cooked. Here is how the sulfur compounds in leeks damage blood cells, what amount is risky, and what to do if your dog eats some.
Why not
Toxic compound: N-propyl disulfide and other sulfur compounds (Allium).
Like onions, garlic, chives, and shallots, leeks contain sulfur compounds (N-propyl disulfide and other thiosulfates) that damage the membrane of a dog's red blood cells. The damaged cells break down faster than the body can replace them, leading to hemolytic anemia.
Cooking or drying does not reduce the toxicity. Leeks in stock, sauteed as a side dish, or dried into seasoning are just as dangerous as raw ones. Dried and powdered forms are actually more concentrated, so even a small amount of soup seasoning containing leek or onion can be risky.
Symptoms often do not appear right away. Hemolytic anemia develops gradually over 1 to 5 days after ingestion, so an owner can easily miss the connection to a meal. The effect is also cumulative, meaning repeated small doses of leek in food can cause the same damage as one larger dose.
The general risk threshold for Allium vegetables is roughly 15-30 g per kilogram of a dog's body weight, though more sensitive breeds, such as Akitas or Shiba Inus, which are more prone to oxidative damage to red blood cells, may react to even less. Leeks should never appear as an ingredient in homemade cooked meals or broth for a dog.
Rough portion
There is no safe amount. Leeks should not be given to dogs in any form or quantity.
Risks
- Hemolytic anemia from red blood cell damage caused by sulfur compounds.
- Toxicity stays the same whether leeks are raw, cooked, or dried into powder.
- Cumulative effect: repeated small doses can cause the same damage as one large dose.
- Hidden risk in broths, soups, and prepared meals that list leek as an ingredient.
Symptoms to watch for
- Weakness, lethargy
- Pale or yellowish gums
- Rapid heart rate and breathing
- Dark urine (red to brown)
- Loss of appetite
- Vomiting and diarrhea
Your dog already ate leeks. What now?
- Find out how much leek your dog ate and in what form (raw, cooked, in broth); this information matters to your vet.
- Contact your vet even if your dog is not showing symptoms yet, hemolytic anemia can develop gradually over several days.
- Watch your dog for at least a week for signs like pale gums, weakness, or dark urine.
- Your vet may run bloodwork and, in more serious cases, provide supportive treatment or a transfusion.
Common questions about dogs and leeks
Are leeks as dangerous as onions for dogs?
Yes, leeks belong to the same Allium family as onions, garlic, and chives, and contain similar sulfur compounds that are toxic to a dog's red blood cells. The risk is comparable, even though leeks have a milder flavor and dogs tend to seek them out less.
Can my dog have soup that leeks were cooked in?
No, cooking does not neutralize the compounds in leeks, and they leach into the broth. Even soup or sauce you have picked the leeks out of can contain enough toxin to harm your dog, especially with repeated servings.
How long does it take for leek poisoning to show up?
Signs of hemolytic anemia often develop gradually over 1 to 5 days after ingestion, so the link to food is easy to miss. If you know your dog ate leek, watch them closely even without immediate symptoms, and let your vet know.
How much leek is dangerous for a dog?
As a rough guide, the risk threshold for Allium vegetables is around 15-30 g per kilogram of body weight, though individual and breed sensitivity varies. It is safer to treat it as zero tolerance and avoid giving leeks to your dog at all, even in small amounts.
Safer alternatives
Can dogs eat broccoli?
Yes, broccoli is safe for dogs in small amounts. It contains isothiocyanates, which in larger doses irritate the digestive tract and cause gas. Stick to small pieces, raw or cooked, with no seasoning.
Can dogs eat carrots?
Yes, carrots are safe for dogs and rank among the best treats you can give them. They're low in calories, full of fiber and beta-carotene, and raw carrots even help clean teeth. Cut them to a size that suits your dog.
Can dogs eat cucumber?
Yes, cucumber is safe for dogs and very low in calories. It's about 95% water, making it a refreshing summer treat and a good option for overweight dogs. Serve it raw, and peel it for dogs with sensitive digestion.
Can dogs eat pumpkin?
Yes, cooked or plain pumpkin flesh is very healthy for dogs, and vets often recommend it to help with digestive upset. Always choose plain pumpkin puree, never pie filling with added sugar and spices.
More from vegetables
Can dogs eat beans?
Yes, plain beans that are cooked thoroughly and unsalted are safe for dogs in small amounts and offer a good dose of fiber and protein. Raw beans are toxic due to lectins, though, and canned or baked beans usually carry too much salt and sugar.
Can dogs eat bell peppers?
Yes, but only sweet bell peppers in small amounts. They aren't toxic and contain vitamin C, but hot varieties like chili peppers or jalapenos should never be given, capsaicin irritates the digestive tract and causes painful burning.
Can dogs eat cabbage?
Yes, raw or cooked cabbage is safe for dogs in small amounts. In larger portions it causes noticeable gas, and heavy long-term intake can affect thyroid function. Skip sauerkraut because of its salt content.
Sources
- ASPCA: People Foods to Avoid Feeding Your Pets
- Merck Veterinary Manual: Onion and Garlic Poisoning in Animals
Last updated 2 September 2026.