Quantity
A few rhubarb leaves can be enough to cause kidney problems in a small-to-medium dog. The stalks are less concentrated but still contain meaningful levels of oxalic acid.
Notes
The most common exposure is garden-grown rhubarb where dogs can reach the plants. The stalks contain lower levels of oxalates and are less dangerous, but the leaves are concentrated enough to cause serious harm. Cooked rhubarb (as in pie filling) has reduced but not eliminated oxalate levels.
Negative Signs
* Drooling and oral irritation (the oxalates burn the mouth)
* Vomiting and diarrhea
* Tremors and weakness
* Bloody or dark urine
* Decreased urination (kidney damage)
* Lethargy
FAQ
Q: My dog chewed on a rhubarb stalk from the garden. Is that the same as eating the leaves?
A: The stalks are much less toxic than the leaves, but they still contain oxalates. A small nibble on a stalk is probably okay for a larger dog — but monitor for vomiting, drooling, or changes in urination. If your dog ate the leaves, that's more serious and worth a vet call.
Alternatives
If your dog likes the tart, crunchy appeal, a small piece of apple (no seeds or core) is a safe, satisfying alternative.
Risks & Disclaimer
If your dog ate rhubarb leaves, call your vet right away. Stalk-only exposure is less urgent but still worth a call, especially for small dogs. Watch for decreased urination or blood in urine over the following 24 hours, which would signal kidney involvement.
