Is Rhubarb Toxic to Cats and Dogs?
Rhubarb is moderately toxic to cats and dogs — the leaves contain soluble oxalates that can cause vomiting and kidney effects. Call a vet if leaves are eaten.
Can cause real harm — call a vet for guidance.
Can cause real harm — call a vet for guidance.
In an emergency, do not wait.
Medical disclaimer: This tool is for general information only and isnot a substitute for veterinary diagnosis or treatment. Toxicity depends on the amount, your pet’s size, and health history. If your pet may have ingested something harmful, contact your veterinarian or a poison control hotline ((888) 426-4435 / (855) 764-7661) immediately — do not wait for symptoms to appear.
What is Rhubarb?
Rhubarb is moderately toxic to cats and dogs — the leaves contain soluble oxalates that can cause vomiting and kidney effects. Call a vet if leaves are eaten.
Also known as: rhubarb leaves, oxalates, rheum, pie plant.
Symptoms to Watch For
🐕 In Dogs
- Drooling, vomiting, and decreased appetite
- Abdominal pain and diarrhea
- Possible kidney effects from soluble oxalates in large amounts
- Weakness and tremors
🐈 In Cats
- Drooling and vomiting
- Abdominal pain and reduced appetite
- Possible kidney effects in larger amounts
What to Do If Ingested
- Remove any remaining rhubarb.
- Note whether leaves or stalks were eaten (leaves are most toxic).
- Call a veterinarian or poison hotline.
Steps apply to both cats and dogs. When in doubt, call a vet or poison hotline before acting.
When to Call the Vet Immediately
Call your veterinarian or a poison control hotline right away if you notice any of these:
- A large amount, especially the leaves, was eaten
- Vomiting or abdominal pain
- Changes in urination or weakness
Frequently Asked Questions
Frequently Asked Questions
Which part of rhubarb is toxic?
The leaves are the dangerous part — they contain high levels of soluble oxalates. The stalks, which people eat, are much lower in oxalates but can still cause stomach upset in pets.
What do soluble oxalates do?
Soluble oxalates can bind calcium and form crystals that damage the kidneys in large amounts, while also irritating the mouth and gut to cause drooling, vomiting, and diarrhea.
How much rhubarb is dangerous?
A small nibble of stalk is usually low risk, but the leaves are far more concentrated. Call a vet if leaves were eaten or if a larger amount was ingested, especially if vomiting or changes in urination appear.
Sources
This entry is reviewed against the following authoritative veterinary sources.
Last reviewed: 2026-07-11