Can Dogs Eat Onion?

Can Dogs Eat Onions?

No, onions are toxic to dogs in any form — raw, cooked, dried, or powdered. Onions contain a substance called N-propyl disulfide that damages red blood cells, leading to a dangerous condition called hemolytic anemia.

Why Onions Are Dangerous for Dogs:

  • N-propyl Disulfide Toxicity: This compound disrupts the oxygen-carrying capacity of red blood cells. Destruction of red blood cells reduces oxygen to vital organs, causing damage.
  • All Forms Are Harmful: Onions are poisonous to dogs whether raw, cooked, fried, powdered, or within other foods.
  • Small Amounts Can Be Dangerous: Even a small quantity of onion can cause severe problems, especially for smaller dogs.

Symptoms of Onion Toxicity in Dogs:

  • Weakness
  • Lethargy
  • Pale gums
  • Red or brown urine
  • Increased heart rate and breathing
  • Vomiting
  • Diarrhea
  • Loss of appetite

What to Do If Your Dog Eats Onions:

  1. Immediate Action: Act quickly if you discover your dog has eaten onions.
  2. Contact Your Veterinarian: Don’t delay. Your vet will guide you on the appropriate steps based on the amount ingested and your dog’s breed/size.
  3. Induced Vomiting (If Recommended): Your vet may recommend this ONLY if the onion was ingested very recently, as it’s ineffective later in the digestion process.
  4. Supportive Treatment: Hospitalization may be necessary with intravenous fluids, oxygen supplementation, or even blood transfusions in severe cases.

Important Considerations:

  • Delayed Symptoms: Symptoms of onion toxicity may not appear immediately, developing over several days.
  • Liver Damage: Severe cases can cause liver damage.
  • Cumulative Effect: Repeated small doses of onion can also cause poisoning over time.

Key Takeaways

  • Onions are highly toxic to dogs and should never be given to them, regardless of the form.
  • If your dog eats onions, contact your veterinarian immediately for urgent advice and treatment.
  • Early intervention is crucial for the best possible outcome.
  • Prioritize your dog’s safety by keeping onions and onion products out of reach.

Can Dogs Eat Onion:

No, you shouldn’t let your dogs eat onions at any cost. Onions contain N-propyl disulfide, which is toxic to dogs. If a dog eats it, it causes onion toxicity, which can cause several fatal medical conditions like hemolysis or hemolytic anemia.

Onions are toxic to dogs in any form. Raw or cooked sliced or not white onions or red onions: they can cause a lot of harm to your dog. It is recommended to be very careful when giving dishes cooked leftovers with onions. Even some baby jars contain it!

So you can imagine you have to be particularly careful if you have a puppy. It will not only take a smaller amount to cause him harm, but the consequences could above all be much greater on his digestive system in the long term.

Nutritional Value Of Onion For Dogs:

Onions contain thiosulfate. The dog’s body does not have the enzymes to digest it. This substance is toxic to animals. The amount of onion that threatens the life of an animal is 15-30 g per 1 kg of animal body weight, and negative manifestations can be noticeable even with a small amount of food eaten – 5 g of onion may be sufficient.

Health Benefits Of Onion For Dogs:

There are no health benefits of onion and onion powder for dogs. Onions can do more harm to your dog than just bad breath. This vegetable can add flavor to human dishes, but it contains a toxin that can cause serious health problems in dogs.

Potential Hazards Associated With Onion For Dogs:

The onion is defined as a vegetable plant, therefore a vegetable. It has countless virtues and is almost always found in our dishes. Due to its composition, it is considered toxic for our dogs. Poisoning can occur quite banally. For example, it can happen if you give your pet table scraps or if it steals an onion from the supply. See below the hazards of onion for dogs.

Liver Damage:

With severe intoxication, a veterinarian can diagnose liver damage. In dogs of large breeds, death may not happen, their body can cope with the negative effect of the product, but serious diseases of the internal organs against the background of poisoning are not excluded.


Poisoning can also occur if your pet eats onion pie, takes bulbs from the garden, or even if you feed baby food jars that contain onions. This vegetable contains sulfur derivatives which cause harmful effects on your dog.

They cause hemolytic anemia. In other words, they destroy dog’s red blood cells. In the worst case, onion poisoning can lead to the death of the animal.

The biggest risk of onion poisoning in dogs is that it takes time for symptoms to show up as toxins build up in the body. A dog can chew onions in the garden or pull off the head from the table (purple onions may seem like a delicacy to a pet – it is not so hot, it has a pleasant sweetish taste), and after 3-5 days it will suddenly feel bad. The owner may not associate the symptoms of the disease with the fact that

Hemolytic Anemia:

Onion poisoning damages the lining of red blood cells and destroys them, causing hemolytic anemia. It can also cause an intestinal disturbance. If the dog regularly eats small amounts of onion or garlic, it can also be poisoned.

If the dog often eats small amounts of onion, the symptoms may be progressive anemia over time, in the form of pale mucous membranes, a deteriorated general condition, and an increased heart rate and respiratory rate.

Onion increases the acidity of gastric juice, but this is not its worst negative property. The danger is caused by organic sulfoxides contained in the plant. When onions are chewed, they decompose in the animal’s body, and the sulfur formed as a result of the formation causes the destruction of red blood cells.

Possible Side Effects Of Onion For Dogs:

Onions are unsafe and toxic food for dogs. Eating it can lead to many harmful effects. Onions contain a chemical called N-propyl disulfide, which is why dogs have harmful effects.

Dogs should avoid eating any portion of the onions plant, such as the juice, stems, and manufactured powders. Onions, along with the other members of the allium family, are toxic to dogs whether they are uncooked, roasted, sautéed, or crushed.

If your dog ingests it, without you knowing it, here are the symptoms that should alert you:

  • A general state of weakness;
  • Excessive breathing is a sign of a high heart rate (tachycardia);
  • Very pale mucous membranes;
  • Yellowing of the eyes or gums;
  • Loss of appetite;
  • Brown urine due to the destruction of red blood cells in his body;
  • Enlarged spleen, enlarged spleen (which you can feel);
  • In addition, in a few rare cases, diarrhea, vomiting, and abdominal pain are also observed in animals.
Can Dogs Eat Onion?

Allergic Reaction To Onion In Dogs:

If your dog accidentally ingests so much, the symptoms can appear between 1 and 2 days later. If you think your dog may have eaten an onion, there are a few symptoms of allergy to look out for:

  • Weakness;
  • Hives
  • Fainting;
  • Reddish eye.
  • Shortness of breath may also occur.
  • Pale mucous membranes

Dog With Diabetes And Onion:

The onion can cause poisoning regardless of the form in which it has been ingested (raw onions
, fried, boiled, dehydrated, etc.). Onion poisoning leads to the destruction of red blood cells and therefore anemia.

As an indication, a 10 kg dog can show symptoms if he ingests the equivalent of a whole onion. If the onion is ingested in very large quantities or if the ingestion is repeated for several days in a row, signs of anemia may appear as weakness, loss of appetite, pale mucous membranes, and dark red urine…

How To Feed Onion To Your Dog:

Onions are very harmful to the dog’s organism since their consumption has a destructive effect on red blood cells. A tiny amount of onion or garlic powder, even 5 grams per body kilo can have very toxic effects, whether fresh, roasted, cooked, or dried. A medium-sized onion or bulb of garlic is enough to have a serious impact on a 20 kg dog. So, do not feed onion to your dog.

How Much Onion Should A Dog Eat:

You should not give onion to your dog. The toxic dose would be 5 to 10 grams per kilogram. So a single onion would be enough to make your pet sick if it weighs 10 kilograms. The damage could start between 12 and 24 hours after ingestion.

Onion-Based Recipes For Dog Treats:

Onions should not be given to dogs, it is contraindicated both fresh and boiled, baked, and fried. It negatively affects not only the digestive and cardiovascular but also the nervous systems of the pet, it can provoke an increase in blood pressure and breathing problems.

All parts of the onion plant are toxic to dogs, including pulp, leaves, sap, and processed powders. Raw or boiled, fried or powdered onions and other plants of the family (garlic, shallots, leeks, and green onions) are harmful to pets.

Onions are very dangerous for dogs. As a warning to those with other furry family members, onions are even more toxic to cats than they are to dogs, so keep your pets away from onion treats.


Onion is very harmful to the dog. It is a plant capable of causing the destruction of red blood cells carrying oxygen. This is commonly called anemia. For a 5kg dog, half an onion should be enough for the first symptoms to appear. So be careful when cooking!


Why Can’t Dogs Eat Onions?

The toxic chemical N-propyl disulfide found in onions makes it not suitable for dogs to eat. It can interfere with the oxygen transport in the blood and destroy the red blood cells.

When red blood cells are destroyed, it leads to hemolysis. Dog’s bodies become deficient in the required oxygen and cause hemolytic anemia. This can worsen dogs’ health and even die without treatment.

Can Dogs Eat Cooked Onion?

No, dogs can’t eat cooked onions. It doesn’t have any impact on its toxicity. Whether it is cooked or fried, onions are not safe for dogs.

What to Do if Your Dog Eats Onions?

If your dog has eaten onion, the treatment is decided by your vet. If you know the amount of onion they have ingested, it can help the vet to prescribe the treatment.

Can Dogs Recover From Eating Onions?

Yes, your dogs can recover from onion toxicity if you seek your vet’s help at the right time. If you know they ingested onions right after ingestion; you can take them to the vet as soon as possible to induce vomiting.

If you take your dog less than 1-2 hours or less after it has eaten onions, then induced vomiting is an effective option. Otherwise, it’s not, as the food might have moved into the intestines. Induced vomiting can ease the condition since the onions are taken out before they get digested.

If you could observe symptoms like red or brown-colored urine, weakness, panting, or loss of appetite, then quick treatment is essential.

Treatments like oxygen supplementation, blood transfusion, and IV fluid support can be helpful in bringing them back to a healthy life.

How Long Does it Take for Onions to Affect Dogs?

The symptoms may appear within 1 to 3 days after the dog has eaten the onion. The initial symptoms may be stomach upset, vomiting, diarrhea, stomach pain, lethargy, and loss of appetite. As the stage becomes critical, the red blood cells get destroyed, and dogs become anemic.

Aapt Dubey
Aapt Dubey

Aapt Dubey, a devoted canine enthusiast and experienced dog Owner, brings boundless passion to our team. With a heart full of love for our four-legged friends, Aapt is dedicated to sharing insights on dog care, behavior, and training to make every pup's life happier and healthier at

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