Rhubarb

Rheum rhabarbarum

Also known as: rhubarb stalks, rhubarb leaves, pie plant

Danger (Avoid)

Rhubarb — especially the leaves — is loaded with oxalic acid, a compound that can cause acute kidney failure in hamsters. The stalks are marginally less dangerous, but for an animal this small, even the lower oxalate concentration in the stalks is enough to cause serious harm. No part of the rhubarb plant is safe for your hamster.

Quantity

A single small rhubarb leaf could contain enough oxalic acid to kill a hamster. The stalks are less concentrated but still dangerous at hamster body weight. No amount is safe.

Notes

Hamsters who free-roam outdoors or have access to a garden are at risk if rhubarb is growing nearby. Even dried rhubarb leaves that have blown into an accessible area remain toxic — drying does not break down oxalic acid.

Negative Signs

* Drooling and mouth irritation (oxalates burn on contact)
* Diarrhea and abdominal pain
* Decreased or absent urination
* Lethargy and weakness
* Tremors and muscle twitching
* Refusal to eat or drink

FAQ

Q: My hamster chewed on a rhubarb leaf that fell from a garden plant. How worried should I be?
A: Very worried. Rhubarb leaves are the most toxic part of the plant, and a hamster's tiny kidneys are extremely vulnerable to oxalate damage. Call your exotic vet right away, even if your hamster seems fine at the moment.

Alternatives

For a crunchy, high-fiber treat, a small piece of celery or a sliver of carrot gives your hamster the texture they enjoy without any oxalate risk.

Risks & Disclaimer

If your hamster ate any part of a rhubarb plant, contact your exotic vet immediately. Kidney damage from oxalates can be rapid and irreversible, especially in a hamster whose kidneys are extremely small. Do not wait for symptoms.