Can Cats Eat Green Onions?

by Alex Kountry
Updated on

Cats are carnivores and their diet should consist mostly of meat. However, there are a few vegetables that cats can eat without any harm. Green onions are one of these vegetables.

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While onions are a healthy part of a human diet, they can be poisonous to cats. Green onions, also known as scallions or spring onions, are a type of onion that is commonly used in cooking. They have a milder flavor than other onions and are often used as a garnish or in salads. Cats should not eat green onions, as they can cause anemia and other health problems.

Nutritional Value of Green Onions for Cats

Green onions, also known as scallions or spring onions, are a type of onion that is harvested before the bulb matures. They are an excellent source of vitamins A, C, and K, as well as manganese and dietary fiber.Green onions also contain small amounts of protein and calcium.

Vitamins and Minerals

Green onions are an excellent source of vitamins and minerals, including vitamin C, vitamin B6, vitamin K, manganese, and chromium. They also contain a significant amount of dietary fiber.

Vitamin C is an essential nutrient that helps support the immune system. Vitamin B6 is necessary for proper metabolism and energy production. Vitamin K is required for blood clotting and bone health. Manganese is involved in many biochemical reactions, including energy production and antioxidant defenses. Chromium is necessary for proper insulin function.

The dietary fiber in green onions can help promote digestive regularity and may also help to lower cholesterol levels.


Green onions are an excellent source of dietary fiber, providing 4 grams per 100-gram serving. That’s 16% of the Reference Daily Intake (RDI) for fiber (2).

Dietary fiber is an essential part of your cat’s diet. It helps keep their digestive system healthy and aids in the prevention of intestinal disorders, such as constipation and diarrhea (3).

Green onions are also a good source of other nutrients that are important for your cat’s health, including vitamins A, C, and K, as well as copper and manganese (4).

The Risks of Feeding Green Onions to Cats

Green onions are a common ingredient in many dishes, but you may be wondering if they are safe for your cat to eat. While cats can safely eat small amounts of green onion, there are some risks to be aware of. The main concern with feeding green onions to cats is the potential for gastrointestinal irritation.

Allium Toxicity

Although green onions are not considered toxic to cats, they can still pose a risk to your feline friend. The biggest concern with feeding green onions to cats is the potential for allium toxicity. Allium is a type of onion that also includes garlic, leeks, and chives. When cats consume allium, it can cause anemia (a decrease in red blood cells) and potentially lead to death.

If you suspect your cat has consumed green onions or any other type of allium, it is important to seek veterinary care immediately. Symptoms of allium toxicity include lethargy, weakness, pale gums, and difficulty breathing. If your cat is showing any of these symptoms, please contact your veterinarian or local emergency animal hospital right away.

Digestive Issues

Green onions contain n-propyl disulfide, which can lead to Heinz Body anemia in cats. This type of anemia is caused by the breakdown of red blood cells, and symptoms include weakness, lethargy, and vomiting. If you think your cat has eaten green onions and is showing any of these symptoms, take them to the vet immediately.

Other digestive issues that green onions can cause in cats include gas, bloating, diarrhea, and stomach pain. If your cat eats too many green onions (or any other food they’re not used to), they may end up with an upset stomach. If your cat is vomiting or has diarrhea after eating green onion, give them plenty of fluids and call the vet if the diarrhea lasts more than a day or two.

How to Safely Feed Green Onions to Cats

Green onions are a popular food choice for humans and many other animals, but can cats eat green onions? The short answer is yes, cats can eat green onions. However, there are a few things you should keep in mind before feeding green onions to your cat.

Introduce Green Onions Gradually

If you’re wondering can cats eat green onions, the answer is maybe. Cats are notoriously fickle eaters, so there’s no guarantee that your cat will like green onions or that they’ll be able to tolerate them if they do try them. If you want to feed your cat green onions, it’s best to do so gradually. Start by giving them a small piece of onion (no larger than a green onion) to see if they’ll eat it. If they don’t seem interested, don’t force them to eat it. Just try again another time.

If they do eat the green onion, wait a few days before giving them another piece. This will help their digestive system adjust to the new food. After a week or so of slowly introducing green onions into their diet, you can start giving them larger pieces or adding green onions to their regular food (if they’ll eat it).

As always, make sure to wash the green onion thoroughly before feeding it to your cat. And be sure to monitor them closely after they eat it, in case they have any adverse reaction (vomiting, diarrhea, etc.). If you notice any problems, stop feeding them green onions and call your veterinarian

Monitor Your Cat’s Reaction

When feeding your cat green onions for the first time, it’s important to monitor their reaction. Some cats may be more sensitive to onions than others and may experience digestive upset. If you notice any vomiting or diarrhea after your cat eats green onion, discontinue feeding and consult your veterinarian.


Based on the information we gathered, it is safe to say that cats can eat green onions in moderation. While there is a small risk of gastrointestinal upset, the likelihood of this happening is low. If your cat enjoys green onions and shows no adverse effects after eating them, there is no need to worry.

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About the author

Alex Kountry

Alex Kountry is the founder of HayFarmGuy and has been a backyard farmer for over 10 years. Since then he has decided to write helpful articles that will help you become a better backyard farmer and know what to do. He also loves to play tennis and read books


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