Can Guinea Pigs Eat Onions?

What are Onions?

Onions are a widely used vegetable in many different cultures and cuisines. They belong to the Allium family, which also includes garlic, leeks, chives, and shallots. Onions can be eaten raw or cooked in many dishes – they have a pungent flavor that adds depth to meals.

Are Onions Toxic for Guinea Pigs?

Unfortunately for guinea pigs (and humans!), onions contain an ingredient called thiosulfate which is toxic if ingested in large quantities. Guinea pigs cannot process this chemical like other animals so it can make them sick if they eat too much of it. As such, onions should not be fed to guinea pigs at all as there is no way of knowing how much thiosulfate is present in each onion and how it will affect your pet’s health.

Can My Guinea Pig Have Onion-Flavored Treats?

No! Even treats that claim to have “onion flavor” should be avoided as these products still likely contain some trace amounts of thiosulfates which can cause discomfort for your pet if consumed over time. If you want to give your guinea pig something special every now and then it’s best to stick with healthy snacks designed specifically for their species – hay cubes, fresh vegetables (not onions!), fruits (without any added sugars), etc..


All in all, the answer is no – guinea pigs cannot eat onions due to their high levels of thiosulfate which could negatively impact their health if consumed regularly or in large quantities. Stick with fresh produce specially designed for guinea pig diets when giving them treats instead!