Do Onions Burn Cats’ Eyes? Onions and Cats

If you’re a cat owner, chances are you’ve been warned about the dangers of onions. But is there any truth to the claim that onions can burn a cat’s eyes? Let’s take a closer look at the science behind this claim.


Do onions burn cats’ eyes?


Onions are a member of the Allium family, including garlic, shallots, and leeks. Alliums contain compounds called sulfoxides and disulfides, which can be irritating to cats’ eyes and respiratory systems. When a cat bites into an onion, these compounds are released and can cause the eyes to tear up and become red and irritated.

In severe cases, onion exposure can cause ulceration of the cornea. Cats are also more sensitive than dogs to the effects of onions, so even smaller amounts can cause problems.

If your cat has been exposed to onions, it is essential to rinse the area around the eyes with clean water and seek veterinary care if there are any signs of irritation or discomfort.




Onions contain a compound called thiosulfate, known to irritate the eyes. When this compound comes into contact with a cat’s eyes, it can cause the tissue to swell and the eyesight to water. In some cases, this swelling can lead to ulcers or even blindness.

While it’s true that onions can irritate a cat’s eyes, it’s important to note that this is only temporary.

The irritation will go away on its own and will not cause any long-term damage to the eyes.

However, if your cat does happen to get onion juice in its eyes, it’s essential to flush the area with clean water as soon as possible to reduce the risk of irritation.


Can cats eat onions?


The simple answer is no; cats should not eat onions.

Onions are a member of the Allium family, including garlic, chives, and leeks. Alliums contain compounds that are toxic to cats and can cause anemia.

Even a tiny amount of onion can cause digestive problems and increase red blood cell destruction.

If your cat does consume onion, you may notice symptoms such as vomiting, diarrhea, lethargy, and loss of appetite.

If you believe your cat has eaten onion, you must contact your veterinarian immediately.

While there is no specific antidote for onion toxicity, prompt treatment can help minimize the symptoms’ severity and improve the chances of a full recovery.


What happens if a cat licks an onion?


If a cat licks an onion, the onion’s juices will cause the cat’s tongue to swell. This can lead to difficulty breathing and, in severe cases, respiratory paralysis.

In addition, the onion’s sulfur compounds can cause cats to suffer from gastrointestinal irritation and anemia.

For these reasons, it is essential to keep onions away from cats. If a cat does ingest an onion, it is necessary to seek veterinary care immediately.

Treatment may involve giving the cat fluids and administering medication to reduce swelling. In severe cases, a cat may need to be hospitalized and placed on a ventilator. However, with prompt treatment, most cats make a full recovery.


How long does onion toxicity last in cats?


Onion toxicity in cats is a serious condition that can lead to hemolytic anemia. Onion and garlic plants contain toxic compounds for cats, and ingesting even a tiny amount can cause health problems.

Symptoms of onion toxicity include vomiting, diarrhea, lethargy, and difficulty breathing. If left untreated, onion toxicity can be fatal.

Treatment for onion toxicity typically involves hospitalization and IV fluids to flush the compounds from the cat’s system.

With prompt treatment, most cats make a full recovery. However, some may experience long-term health problems such as anemia.



So, there you have it! Onions can indeed burn a cat’s eyes, but only temporarily. And while there’s no need to avoid onions altogether, you may want to keep them out of your furry friend’s reach to be on the safe side.

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Michael Grover

About Me I have been a pet owner for most of my life. I am now retired and spend my days writing about problems relating to cats, dogs, and funeral poems. I am passionate about stopping animal cruelty in any shape or form. My passion is to help people like you identify behavior problems in cats and dogs. That is what I do. Over the years of my life, I have always kept cats and dogs. About four years ago I retired and found I had a lot of time on my hands, so I started to write all about dog and cat problems. It was suggested that I start up a website and publish my words to help people with their pet problems. I am still writing every day and hope you find my articles useful. Regards Mike Grover

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