Can Cats Eat Onions? CanOrCannot.Com – There are a lot of ways to prepare onion for a dish: chopped, sliced, split into two, etc.

Then, it could be cooked with either vegetables or meat. When mixed with meat, the taste is more delicious for human.

Unfortunately, sharing the tasty meat and onion dish to the cats is not okay.




What’s Poisonous In Onion?

Saying that onion is dangerous for the cats’ health will not convince the owners. Further explanation is needed.

There is something in onion that makes the cats sick. The substance is called thiosulphate.

Even a tiny dose of it inside the cats’ body could trigger a condition called hemolytic anemia.

A cat that suffers from the condition is having problems with red blood cells.

While they circulate throughout the body, they will burst out. This is how serious an onion toxicity could affect the cats.




Even for bigger pet like dogs, similar case cannot be avoided. What makes onion more dangerous is the symptoms appearance.

It takes three to four days to show.

If onion has the deadly toxic, why humans are not affected? Good question.

It is because human digestive track has special enzyme to break down the toxic. Cats, on the other hand, don’t have the enzyme.

Onions are not part of their natural diet, after all. That explains why even a gram of onion could hurt the cats.

Which Part Of Onion Is Dangerous?

Photo Image Can Cats Eat Onions Is It Dangerous
Can Cats Eat Onions

Some owners might try to find a way to find the “healthy” part of the onion. The bad news is: none of it. Every part of onion is dangerous.

There is no certain cooking method that could reduce the effect of onion toxicity on cats.

So, the best thing to do is preventing the cats to have a taste of any dishes with onion in them.

In addition to onion, any family of root vegetables is dangerous as well.

Some names on the list are garlic, chives and leek. All of them, along with onion are the member of Alium species.

Although they have different appearances, there is one thing in common: containing oxidants that could harm the feline fellow.

How to Prevent The Onion Poisoning?

Keep in mind that any exposure to onion may affect the pets’ health. Therefore, it is best to cut out any health risk condition.




  • Clean the cage thoroughly when the cats are playing with onions
  • Never share leftovers
  • Keep the cats inside the cage when the owners are cooking or eating
  • Make sure the food storage couldn’t be accessed by cats
  • Play with them; sometimes the meowing doesn’t mean that they are hungry.
  • Keep their meals on the schedule; it will lower the chance for them to beg for more food.

Is There Any Specific Lists To Avoid?

Since the onions are very bad for the cats’ health, now the owners have to think twice before sharing anything to the cats.

But then, what are the common food that contains onion in it?

  • Pizza

Who doesn’t love pizza? Some people could have pizza for their three meals in a day.

Unfortunately, this tasty meal is not for cats. Barely any pizza has no onions in it. Safe all the pieces for the owners only.

Read too:

Although the label says “tomato”, doesn’t mean that there is no onion in it.

The thing is the onion has been crushed and mixed nicely in it. No wonder the owners couldn’t spot the piece.

  • Chinese Foods

Yes, the owners should never ever give their leftover chinese food to the cats. All chinese dishes include onion and its family in the recipe.

  • Any Dishes with “Onion Sauce”

Sometimes the owners are just too blind to see the big warning on the board.

Some menus have special sauce on the meat. Again, even though the owners are sure that they give the meat only, the onion effect is still there.

Can Cats Eat Onions?

What Are The Symptoms Of Onion Toxicity?

The owners who learn about the dangerous side of the onion before the case actually happens are lucky.

Some prevention steps could be taken.

However, some owners might have shared the onions ans are now freaking out about it, especially because the symptoms take several days to occur.

Still, it is better to recognize them before it becomes too late.

  • Raising heart rate
  • Panting
  • Sluggish
  • Vomitting
  • Diarrhea
  • Losing appetite

Those are the early stage of onion-toxicity. If the owners fail to recognize it, more dreadful things will happen inside the cats’ body.

  • Hemolytic anemia
  • Heinz body anemia
  • Allergic reactions
  • Asthma
  • Gastrointestinal problems
  • Lethargy
  • Contact Dermatitis
  • Liver Damage

Even though all of these symptoms cannot be seen, there are two physical change that could be recognized.

First, the urine is mixed with blood. Second, the cats are often fainting.

Can Cats Eat Onions?

What to Do When The Cats Are Poisoned?

The next important thing to learn is the steps to take when the poisoning happens:

  1. Track the meal eaten by the cats in the last three days. If possible, recall how much onions it has had.
  2. Call the veterinarian. Delaying the help is not suggested. Thus, the owners must have the phone number in hand. If there is no answer, try to find the nearest emergency pet lines.
  3. Give first aid. If the owners know that the pets had eaten too much onion, then induce vomiting before driving to the closest vet.

What Will The Vet Do To Cure The Poisoned Cats?

Upon arrival, the cats will undergo several diagnostic tests. It will help the doctor to determine how bad the poisoning case is.

Then, an intravenous therapy will be administered. It flushes out all the toxins inside cats’ blood and also triggering the production of new and healthy red blood cells.

In severe cases, blood transfusion might be needed.

Can Cats Eat Onions? Conclusion!

The top list of food that cannot be shared with cats is onion, salt, and milk.

Therefore, think twice before sharing a dish. If it has onion in it, just enjoy it.

Never give the dishes to the cat, even when it is only the meat. No owners want their pets to be sick, right?


source: petinsurance¹, petmd², wagwalking³

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