# Can guinea pigs eat rhubarb?

> No — toxic to guinea pigs. Verdict: toxic. Never · None — do not feed · fresh and raw only.

Photo: A bundle of cut rhubarb stalks.

## Quick answer

No. Rhubarb sits on RVC's poisonous plants list — the same line that carries potato — and Agriculture Victoria's guinea-pig care page names "rhubarb leaves" explicitly among foods "poisonous to them". Wood Green's harmful-food list rounds it out. Three institutions, no dissent, for this species.

The mechanism note stays labeled: oxalate-driven kidney damage has a same-species clinical record — a guinea pig fed an oxalate houseplant developed kidney failure (PMID 16933558) — but the case plant was a peace lily, not rhubarb, and no rhubarb feeding study exists. Our recommendation: no rhubarb in any part, and the exposure guidance below is the practical part of this page.

## Why is rhubarb bad for guinea pigs?

What the sources say: the poisonous-plants line from RVC (Dec 2022) covers "rhubarb" without part qualification, and Agriculture Victoria's sentence names the leaves with the register's strongest word — "poisonous to them". Wood Green files rhubarb beside potato, onion and garlic.

What's missing: a rhubarb-specific guinea-pig study — none exists. What remains registered is the oxalate mechanism class (the peace-lily kidney-failure case, same species, same mechanism family) and the institutional consensus. Our recommendation: every part stays out of the cage, leaves above all.

## What to do instead

Nothing to prepare — rhubarb is off the menu whole: stalks, leaves, and any patch your guinea pig can reach. Garden rhubarb is the usual exposure route, so fence the bed or supervise floor time nowhere near it. Cooked rhubarb from the kitchen changes nothing.

If your guinea pig has eaten rhubarb, remove the material, note roughly how much and which part, and contact your vet straight away — even with no symptoms. Over the next day watch for lethargy, loss of appetite, drooling, diarrhea or droppings changing, and seek care promptly if any appear.

## Who stands behind this verdict

Written by [Patrick Li](/authors/patrick-li/). Editorially reviewed 2026-09-12 · Evidence checked 2026-09-12.

Evidence: Multiple sources agree · Evidence from this species.

No veterinarian has reviewed this page. It is educational guidance checked by the author against the cited sources — for health decisions, talk to your vet.

## Wondering about these too?

| Food | Verdict | How often |
|---|---|---|
| [Arugula](/guinea-pigs/can-guinea-pigs-eat-arugula/) | safe | Daily |
| [Beetroot](/guinea-pigs/can-guinea-pigs-eat-beetroot/) | safe | Daily |
| [Bell pepper](/guinea-pigs/can-guinea-pigs-eat-bell-peppers/) | safe | Daily |

**See also:** the [Food Checker](/guinea-pigs/what-can-guinea-pigs-eat/) photo wall covers every reviewed food with its verdict badge.

## Related tools

- [Guinea Pig Vitamin C Calculator](/guinea-pigs/vitamin-c-calculator/): Guinea pigs need 10–30 mg of vitamin C every day because they cannot make or store it. Converts the daily vitamin C target into food and supplement portions by life stage.

## Frequently asked questions

**Q: Can guinea pigs eat rhubarb stalks?**

No. Humans eat the stalks, but that practice is not a register entry for guinea pigs: RVC's poisonous-plants line covers "rhubarb" with no part qualification, and no source registers the stalk as safe for this species.

**Q: Are rhubarb leaves poisonous to guinea pigs?**

Yes — this is the one part with an explicit, named mention: Agriculture Victoria lists "rhubarb leaves" among foods "poisonous to them" for guinea pigs. Treat the leaves as the worst part of an all-round excluded plant.

**Q: What if my guinea pig ate rhubarb?**

Remove the rest, note how much and which part, and call your vet straight away even if your guinea pig seems well. Watch for lethargy, appetite loss, drooling or dropping changes over the next 24 hours.

**Q: Is cooked rhubarb safe for guinea pigs?**

No — cooking is not modeled anywhere on this register, and the site-wide rule is fresh and raw only for everything that is allowed. Heat treatment certainly does not turn a poisonous-list plant into feed.

## Safety notes

Introduce any new food gradually: a small taste at first, building up over a week or so, and keep every serving fresh and raw. Hay stays the main event at around 80% of the day's eating, with fresh vegetables as the supplement.

**Warnings:**
- Agriculture Victoria lists "rhubarb leaves" among foods "poisonous to them" for guinea pigs; RVC lists rhubarb on its poisonous plants and Wood Green names it in its harmful-food list.
- No guinea-pig-specific rhubarb study exists, so this verdict rests on institutional lists plus the registered oxalate-kidney mechanism — treat any exposure as urgent.

**When to contact your vet**: Guinea pigs hide illness well. Contact your vet promptly if your guinea pig stops eating or passes fewer droppings, seems lethargic or in pain, has diarrhea, or shows any sudden change in behavior — small pets go downhill fast, and same-day advice is always the safe call.

If your guinea pig ate this food: Remove any remaining rhubarb — leaves or stalks — and contact your vet straight away for advice, even if your guinea pig seems well.
What to watch for: Watch closely over the next 24 hours for lethargy, loss of appetite, drooling, diarrhea or any change in droppings, and seek veterinary care promptly if any of these appear.

## The sources behind this verdict

1. [RVC Beaumont Sainsbury Animal Hospital: Feeding Your Guinea Pig (factsheet PDF)](https://www.rvc.ac.uk/Media/Default/Beaumont%20Sainsbury%20Animal%20Hospital/EXOTICS/Animal%20Care%20Factsheets/Guinea-pig-feeding-guidelines-and-advice-Dec-2022-NS.pdf) (grade A, 2022-12). Scope: Poisonous plants list. Excerpt: "… potato, rhubarb, tomato plant (fruit can be eaten) …"
2. [Agriculture Victoria: Caring for your pet guinea pig](https://agriculture.vic.gov.au/livestock-and-animals/animal-welfare-victoria/other-pets/caring-for-your-pet-guinea-pig) (grade B, 2025-11-28). Scope: Government poisonous-foods sentence for pet guinea pigs (rhubarb leaves named). Excerpt: "Don't feed your guinea pig potatoes, onions, rhubarb leaves and oxalis clover as these species are poisonous to them."
3. [Wood Green: Poisonous food and plants for guinea pigs](https://woodgreen.org.uk/pet-advice/guinea-pig/poisonous-food-and-plants-for-guinea-pigs/) (grade B, 2025-07-21). Scope: Harmful-food list. Excerpt: "Some foods that can be harmful include: Potato / Onion / Garlic / Rhubarb"

Grades rate the source, not the claim: S veterinary manuals · A research & university clinics · B welfare organizations · C practitioner education · D not cited. Methodology: /methodology/.

Written by Patrick Li. This guide is informational and not a substitute for veterinary care.
Canonical page: https://petguidecalc.com/guinea-pigs/can-guinea-pigs-eat-rhubarb/