Warning Dog owners! Are Onions Bad for Dogs?

Are Onions Bad For Dogs

Can Dogs Eat Onions? and are Onions Bad for Dogs?

No, dogs should not be allowed to eat onions.

Some of the foods which we enjoy to eat can also be shared with our four-legged best friend, but onions are certainly not one of them.

Onions contains N-propyl disulfide, which causes red blood cells to break down which then leads to anemia in dogs. The N-propyl disulfide will attach itself to oxygen molecules within your dog’s blood cells, this then causes oxidative damage. Preventing blood carrying oxygen around the body properly.

Not only this, but it also causes a dog’s immune system to attack its own red blood cells, which is called hemolsis.

Onions are part of a family of root vegetables called Allium. These include the onion, garlic, leek, shallot, chive and more. All of these vegetables are toxic to dogs and should be avoided!  

Are Onions Bad for Dogs?

Onions are considered to be one of the most dangerous human foods for dogs to consume.

The toxins within onions can lead to serious poisoning to dogs, which can be fatal. So, are onions bad for dogs? YES, I would say so!

A dog’s health, weight, and breed will play a part in the toxicity level of any onion which has been eaten by your pooch.

Japanese breeds are believed to be even more susceptible to being poisoned by onions than other breeds.

No Onion Rings
No Pizza
No Onions

Are All Onions Bad for Dogs?

Yes, all types of onion are toxic to dogs, Yellow, Red, white, shallots, the list goes on. They are all toxic to dogs. It doesn’t matter if the onion is fresh, cooked, dried, frozen, powdered or any other form of onion you can get, they are all poisonous to dogs.

It is best practice to not even give your dog any food which has been cooked with onions. After all, it is far better to be safe than sorry.

If you are likely to be giving your dog some of your dinner which has come from a packet, be sure to read the label carefully, to be sure onion isn’t an ingredient.

You may be surprised how many of our foods include onion as an ingredient, so always check the label before sharing any with your dog.

Is all of an Onion Toxic to Dogs?

Dogs should not be allowed to eat any part of an onion, this includes the leaves, skin, flesh, and the juice from an onion.

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How much Onion does it take to be Toxic to a Dog?

Not a lot, toxicity will occur if a dog consumes more than 0.5 percent of its total body weight in onion, in a short space of time.

Therefore, a small dog would only need to consume a very small amount of onion or another Allium food to become really ill. And it wouldn’t take too much to cause health problems to a big dog breed either.   

Even very small amounts of onion over time will build up in a dog’s body and can cause toxicity.

My Dog ate Onion!

There is a good chance if your dog ate a very small amount of onion, they wouldn’t become sick, particularly if it is a large dog breed. Dogs don’t generally like the taste of onion, so there is a good chance he/she wouldn’t eat enough to cause a major problem.

However, if your dog has eaten any amount of onion, I would advise seeking advice from your veterinarian straight away.

my dog ate onion

Symptoms of Onion Toxicity

Symptoms of onion toxicity include:

  • Reduced appetite
  • Weakness
  • Lake of coordination
  • Panting
  • Vomiting
  • Diarrhea
  • Lethargy
  • Increase in salivation
  • Weakness
  • Pale gums
  • Red or brown tinged urine
  • Increased heart rate

If your dog has eaten onion and you notice any of these symptoms, seek veterinary attention immediately.

If treatment is administered early, then the outlook will be better for your pup, however, treatment may not be as effective if not treated by a veterinarian straight away or in severe cases.

It’s a great practice to always have the number of an emergency vet or emergency clinic, just in case your usual veterinarian is unavailable.

Treating Onion Toxicity

If your dog has been diagnosed by a veterinarian as suffering from onion toxicity, treatment may consist of:

  • Induced Vomiting
  • Stomach Flushed
  • Medication to Absorb the Toxin
  • Intravenous Drip
  • Supportive Care
  • Oxygen Supplementation (severe cases)
  • Blood Transfusion (severe cases)

All of the above can be avoided by not feeding foods containing onion or letting your dog get access to foods containing onion.

Protecting your Dog

Never give human food to your puppy or dog unless you have researched it thoroughly and confirmed with your vet, that it is safe for your dog.

Keep onions, garlic, and other allium vegetables well out of reach of dogs.

Make sure your dog can’t get to any leftovers or peelings which have been thrown in the trash.  

can dogs have onion


So, When it comes to dogs and onions, Are onions bad for dogs? YES.

Onions are one of the worst human foods you could give to your dog. Not only are they really bad on their own as a vegetable, but also as an ingredient in other foods. Plus, the fact it only takes a small amount to cause your beloved pet to become sick.

If you suspect your dog has ingested any onion, contact your veterinarian as soon as possible.

There are many human foods that dogs can eat, I recommended researching any human foods you intend on giving to your dog. I have written articles about other human foods, some of them can be eaten by our pooches, some of them can’t. Check them out below!

Are Oranges Good For Dogs? Everything You Need To Know!

Ultimate No.1 Guide: Can Dogs Have Tomatoes?

Healthy Super Fruit, But Can Dogs Have Watermelon?

Warning! Are Walnuts Bad For Dogs? Find Out Here!

No.1 Complete Guide To: Can Dogs Have Strawberries?

Attention Dog Owners! Healthy Or Forbidden? Can Dogs Have Cinnamon?

Truth About: Are Apples Good For Dogs?

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