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No, dogs cannot eat green onions. It is best to avoid giving your dog any kind of onion because they all contain harmful substances that are indigestible and can harm your dog’s health. Excessive consumption of green onions can be fatal for dogs and requires immediate medical attention.

Green Onions
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Dangerous: This food is generally considered a serious threat to the health and wellbeing of dogs. Please contact your vet, a veterinary hospital or pet poison control if you suspect your dog has eaten this food recently.

Why Can’t Dogs Eat Green Onions?

Dogs cannot eat green onions because of a particular substance called thiosulfate. Your dog’s digestive system cannot digest this substance, and it can cause gastrointestinal issues for your dog.

Additionally, green onions contain a chemical compound called N-propyl disulfide. The substance attaches itself to a dog’s red blood cells causing their immune system to attack the red blood cells, assuming they are a threat. This process is known as hemolysis and can be life-threatening.

TIP: If you want to incorporate more types of food into your dog’s diet, choose safe herbs and vegetables that are nutritious for them.

What to Do if Your Dog Ate Green Onions?

If your dog has eaten a lot of green onions, contact your vet.

An accidental bite may not harm a large dog, but it will cause abdominal discomfort, vomiting, and diarrhea. At the same time, even a bite can be fatal for small dogs.

Hence, regardless of size, get in touch with your vet immediately so they can begin treatment promptly.

Frequently Asked Questions

  • No dogs cannot eat scallions. In fact, they are toxic, and scallions can harm your dog’s health.

  • The vet will induce vomit if your dog has eaten a lot of green onions. However, you should never try this treatment on your own without the veterinarian’s guidance because it can be dangerous.

  • Yes, even a small amount of onions can hurt your dog, especially if they are small-sized. A large dog may get away with a very small amount. Regardless, it is best to visit the vet to ensure your dog’s safety.

About the Writer
Dan Greco , Dog Dad

Having been a dog dad for 5 years, I know how hard it is to make sure your dog gets the right nutrients and stays away from hazardous foods. With the help of a veterinarian who specializes in nutrition, I created this blog to help dog owners quickly access food information they need.

photo of vet holding a pup
About the Contributor
Dr. Hillary Wolfe , Veterinarian & Certified Food Therapist

Dr. Wolfe holds a doctorate in veterinary medicine from Kansas State University and holds nutrition certifications from the NAVC and CIVT. Her business, Tula Veterinary Nutrition, hosts online courses that teach owners how to cook for their pet for optimal health and longevity. Follow her on Instagram at @doctorwolfe.dvm for dog nutrition tips, recipes and insights.