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Can Guinea Pigs Eat Fennel? Vet-Approved Facts & Safety Guide

Chantelle Fowler

By Chantelle Fowler

three bulbs of fresh fennels

Vet approved

Dr. Ashley Darby Photo

Reviewed & Fact-Checked By

Dr. Ashley Darby

Veterinarian, BVSc

The information is current and up-to-date in accordance with the latest veterinarian research.

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Fennel is a flowering plant in the carrot family. This hardy, perennial herb has a unique flavor and crisp texture that lends itself well to dishes like stews, pastas, and salads. But is fennel something you can safely share with your guinea pig pets?

Yes, guinea pigs can eat several parts of the fennel plant, including the tops, the green fronds, and the bulb. However, it should only be offered in moderation alongside a healthy diet. Read on to learn more.

Divider Guinea Pig

The Benefits of Offering Fennel to Guinea Pigs

Offering fennel (Foeniculum vulgare) to your guinea pig has two main benefits: its high fiber and vitamin C content.


Fennel is a great fiber source. Fiber is an essential element of any guinea pig diet, as it promotes gut and digestive tract health.


A variety of foods to browse through provides environmental enrichment for your guinea pig. Fennel has a distinct taste which some guinea pigs appear to enjoy.

sliced fennels on the table
Image Credit: KarepaStock, Shutterstock

The Risks of Offering Fennel to Guinea Pigs

Despite its benefits, fennel is only good for your piggies if fed in small amounts and only offered occasionally.

Calcium Content

Fennel contains a high amount of calcium, which may contribute to the formation of bladder stones if it’s offered too often. Excess calcium is excreted in the urine, so while guinea pigs need calcium for optimal health, they mustn’t be fed too much. A little bit shouldn’t do any harm but too many high-calcium foods over time is definitely a problem.

Digestive Issues

Too much of anything can cause digestive upset, especially if they aren’t used to eating it. When giving fennel start with a small amount and monitor for any signs of diarrhea.

How to Offer Fennel to Guinea Pigs

If you’ve concluded that the benefits of offering fennel to your piggy far outweigh the risks, you need to know how to offer it to your pet.

It would be best if you only gave fennel to your guinea pig once a week and offered it in very small quantities. While the plant does provide benefits, there are plenty of better-suited veggies you should use as everyday staples instead.

close up three fennels
Photo Credit: Dani Vincek, Shutterstock

Can Guinea Pigs Eat All Parts of the Fennel Plant?

Unfortunately no; not all parts of the fennel plant are safe. The fennel fronds are your best bet if you want the most nutritional bang for your buck.

You can offer the bulb, but don’t overdo it due to the high calcium content.

You shouldn’t offer fennel seeds to your guinea pig as they can present a choking hazard. The seeds have too much calcium and carbohydrate for a guinea pig, so it’s best to steer clear of them altogether.

Note: As with any dietary additions, you must introduce fennel gradually to your pet’s diet. This will give his body time to adjust to the new food and allow you to watch him closely for any signs of digestive upset.

What Other Herbs Can Guinea Pigs Eat?

Numerous herbs are appropriate and safe for your piggy. If you’re looking for foods you can include in your pet’s diet to prevent food boredom, the following options are great:

  • Basil
  • Cilantro
  • Dill
  • Mint
  • Parsley
  • Oregano
  • Thyme
Merino guinea pig eating grass
Photo Credit: Natalia Kuzmina, Shutterstock

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Final Thoughts

Fennel is a great treat you can offer your guinea pig occasionally. It provides your piggy with a good source of vitamins, minerals, and a hefty dose of fiber. Unfortunately, due to its high calcium content, this is not an herb we recommend offering more than once per week.

Featured Image Credit: pilipphoto, Shutterstock

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