Can Guinea Pigs Eat Onions? (Here Are The Facts)

Onions are common in most households. So it isn’t difficult to lay your hands on one to use. To feed your pet guinea pigs onions, you must check the facts to see if that is possible.

This article will examine whether you can feed your guinea pigs onions and the risks involved.

Here’s If Guinea Pigs Can Eat Onions

Guinea pigs cannot eat onions. Onions have a high amount of sulfur. The sulfur breaks down into a compound disulfide. Disulfides are toxic to red blood cells. Therefore oxygen cannot be carried to vital organs. This lead to anemia, urinary problems, and sometimes death. Ingesting onions also can have an impact on your guinea pig’s delicate digestive system.

Can guinea pig eat onions

Nutritional Facts Of Onions

Onions have some minerals and vitamins which can help in the well-being of your guinea pigs. But due to the disulfide compound in onion, you should never feed it to your guinea pigs. They are toxic to guinea pigs

Here is the list of the nutritional fact of one medium-sized onion:

  • Fat – 0.1g
  • Sodium – 4.4mg
  • carbohydrate – 10.3g
  • Fiber – 1.9g
  • Sugar – 4.7g
  • Protein – 1.2g
  • Potassium – 161mg
  • Vitamin C – 8.1mg
  • Folate – 20.9 mcg
  • Manganese – 0.1mg
  • Vitamin B6 – 0.1mg

From the list above, you can see onions do contain a good amount of Vitamin C. Vitamin C plays a major role in the overall health of your guinea pigs. Lack of this vitamin can lead to scurvy. They get most of their Vitamin C from fresh vegetables and fruits.

Unfortunately, you can’t give onions to your guinea pigs. There are other alternative vegetables where your guinea pigs can get their vitamin C.

Here are a few we have listed below:

  • Broccoli
  • Cucumbers
  • Bell Peppers( Red has the highest concentration of Vitamin C)
  • Dark leafy greens
  • Cabbage
  • Brussel Sprouts

If you feed your guinea pig vegetables, make sure to have different varieties. Don’t feed your guinea pigs one single vegetable and it shouldn’t be their only main meal.

Can You Feed Guinea Pigs Raw onions?

Onions belong to the Allium family. Research has shown animals that are fed from the Allium family can be toxic to their bodies. Guinea pigs shouldn’t be fed raw onions. Feeding your guinea pigs raw, cooked, and fried onion is a danger to their health.

So you must avoid it completely. You don’t want to end with complications and even death.

Is It Safe To Give Guinea Pigs Onions?

Onion contains sulfur compounds. when your guinea pigs ingest onions, the sulfur compounds are broken down into disulfides and thiosulphates which are known to be toxic to animals. So it is never safe to give guinea pigs onion.

There are reasons you should never feed your guinea pigs onions.

Here are the risks you should be aware of if you feed guinea pigs onions


The compound disulfide in onions is toxic to red blood cells. The red blood cells carry oxygen throughout the body. Since the red blood cells are damaged as a result of the disulfide, blood cannot be carried throughout your guinea pig’s body.

Here are the symptoms you will notice when your guinea pig is anemic:

  • Your guinea pigs become lethargic
  • Your guinea pigs refuse to eat
  • Your guinea pigs will have decreased exercise routine

Vomiting And Diarrhea

Guinea pigs have a delicate digestive system which makes it difficult for them to handle any harmful toxic compound. Onions are toxic to guinea pigs.

Feeding guinea pigs onions can upset their tiny stomachs and this can result in vomiting and diarrhea.

Urinary Problems

Onions contain calcium. Guinea pigs do not need a lot of calcium. If your guinea pigs are fed a diet high in calcium, they are prone to bladder and kidney stone issues.

You must keep an eye on your guinea pig’s urine from time to time. If you observe white urine stains, it is normal. However, when the stain has a gritty texture or blood, it is a sign of excess calcium.

You must consult your Vet to help you deal with the problem.


If you allow your guinea pigs to eat onions without you taking note of the symptoms, you are in trouble. Your guinea pig’s delicate digestive system can’t handle onion. It is highly toxic to guinea pigs.

If you don’t treat onion poisoning in your guinea pigs this could lead to death. So contact your Vet immediately if your guinea ingests onion.

Types Of Onion

Onions come in different varieties and shapes. As a guinea pig owner, you must know the types of onions available on the market. We have researched the different types of onions.

Here are the types of onions we found:

  • Red Onions
  • Yellow Onions
  • Sweet Onions
  • Green Onions
  • White Onions
  • Shallots
  • Leeks

Can Guinea Pigs Eat The Skin Of An Onion?

You shouldn’t feed your guinea pigs the skin of an onion. The skin of the onion has the compound disulfide. This compound is known to be toxic if your guinea pigs ingest it.

So feeding your guinea pig the skin of an onion can lead to complications. You want to avoid that entirely.

Can Guinea Pigs Eat Spring Onions?

Spring onions or scallions shouldn’t be fed to your guinea pigs. Since spring belongs to the family of Allium, they still contain the compound disulfide.

Therefore Spring onions are toxic to your guinea pigs.

Can Guinea Pigs Eat White Onions?

White onions like other onions should never be fed to your guinea pigs. White onions are toxic to your guinea pigs. If you feed your guinea pigs white onions, they can end up with health complications or result in death.

The compound disulfides in white onions make them toxic.

Can Guinea Pigs Eat purple Onions?

You shouldn’t feed guinea pigs purple onions. Purple onions are also toxic to your guinea pigs.

Purple onions also contain the compound disulfides.

Can Guinea Pigs Eat Onion Chives?

Onion Chives belong to the Allium family. They contain the substance disulfides are known to be toxic to guinea pigs.

So you should never feed your guinea pigs onion chives

What Should You Do If Your Guinea Pigs Eat Onion?

Onions as we have discussed are toxic to your guinea pigs. The best way to protect your guinea pigs is to prevent this from happening in the first place.

However, accidents do occur. Especially if you buy freshly mixed prepared vegetables in the supermarket and forget to read the label.

Onions are known to cause digestive issues, respiratory problems, anemia, and sometimes death in guinea pigs.

If you feed your guinea pig accidentally with onions of any type, you must contact your Veterinary immediately. Your Vet should be able to help you deal with onion poisoning.

Final Thoughts

Onions come in different shapes and varieties. Onions contain the compound sulfur. The sulfur compound is what breaks down into a compound known as a disulfide.

Disulfides are toxic to the red blood cell of guinea pigs. These can result in your guinea becoming anemic, respiratory problems, and sometimes death.

Don’t forget their delicate digestive system can’t handle onions.

So you should avoid feeding your guinea pigs any type of onion.



Onion Toxicosis


Onion Nutrition Facts and Health Benefits

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