DIET & NUTRITION
2 min

Why Are Onions Bad for Dogs: Health Risks and Emergency Tips

Onions may spice up our dishes but they pose a serious risk for our dogs. Discover the reasons behind their toxicity and the steps to take if your pup eats one.
Arpita Thakur
Arpita Thakur
Dog Nutritionist
Table of contents
Onions are a popular kitchen staple in many cuisines lending incredible flavour, aroma, and depth to the dishes. It is especially hard to picture a traditional Indian meal without them! But while onions may make our meals better, what about our canine companions? Can dogs have onions? Unfortunately, the answer is a resounding no! In this article, let’s explore exactly why are onions so bad for dogs and provide essential steps to take if your dog gets into them.

Can Dogs Eat Onions?

Onions are toxic to our dogs and should never be included in their diet, regardless of whether they are raw, cooked, fried or powdered. Other types of onions from the Allium family such as green onions, chives, and red, white, yellow, and sweet onions should also be avoided.
Additionally, many processed and prepared human foods often contain onion or onion-derived ingredients, so it's essential to steer clear of giving your dog snacks, soups, or seasonings that might contain onion in any form.

Why are Onions Bad for Dogs?

A toxic compound in particular known as N-propyl disulfide is the reason why onions are bad for dogs. N-propyl disulfide affects a dog's red blood cells by binding to haemoglobin, the molecule responsible for carrying oxygen throughout the body. N-propyl disulfide causes oxidative damage to red blood cells, leading to their rupture in a condition known as haemolysis. This results in haemolytic anaemia, a serious and potentially life-threatening condition. Symptoms can manifest within days and may include:
  • Lethargy
  • Weakness
  • Pale gums
  • Reduced tolerance for exercise
In severe cases, this condition can lead to collapse, organ damage, and even death if not treated promptly. A complete blood count is often necessary for diagnosis.

What To Do If Your Dog Eats Onion?

If you suspect your dog has eaten onions, it is crucial to seek veterinary care immediately, even if symptoms have not yet appeared. The veterinarian may induce vomiting or administer an appropriate dose of activated charcoal to prevent further absorption of the toxin. Do not attempt to induce vomiting at home unless you are specifically instructed to do so by a veterinarian.
After initial treatment, your dog will need close monitoring for several days to ensure they recover fully. Follow-up blood tests may be required to assess red blood cell levels and ensure no further damage occurs.

The Dog Onion Toxicity Calculator

To help in assessing the potential risk if your dog has eaten onions, the dog onion toxicity calculator is a valuable resource for pet parents. It takes into account your dog's weight and the amount of onion consumed to estimate toxicity levels. While it cannot replace professional veterinary advice, it provides crucial insights into the severity of the situation. By entering the relevant details, you can gain a better understanding of whether immediate veterinary care is necessary, helping to ensure your furry friend gets the support they need as soon as possible.
Check out the dog onion toxicity calculator to assess your pet's risk!

How to Prevent Accidental Onion Poisoning in Dogs?

  • To prevent accidental onion ingestion, it is best to avoid sharing any human food with your dog, especially if you are unsure of the ingredients. Foods prepared for human consumption often contain onions or other potentially harmful ingredients for dogs.
  • Ensure that everyone in your household and guests are aware of the dangers of feeding onions or onion-containing foods to dogs.

  • If your dog has ingested onion or is showing signs of distress, don't wait—contact your vet immediately.
In conclusion, while onions are a common ingredient in many diets, they pose a serious and potentially life-threatening risk to dogs. Understanding why onions are toxic for dogs, recognizing the signs of onion poisoning, and knowing what to do if your dog eats onion are vital steps in protecting your furry friend. Always be cautious with food ingredients, and seek veterinary care immediately if you suspect your dog has consumed onions.
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About the author
Arpita Thakur
Arpita Thakur
Dog Nutritionist, 5 yrs exp
Arpita Thakur is a Canine Nutrition Consultant and founder of Eternal Canine. She holds a Diploma in Canine Nutrition from the British College of Canine Studies along with multiple other certifications.
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