Quantity
A few rhubarb leaves can be lethal to a rabbit. Even a small piece of stalk contains enough oxalic acid to cause harm. There is no safe amount of rhubarb for rabbits, in any form.
Notes
Garden-grown rhubarb is the primary risk. Rabbits with outdoor access or free-roaming garden time will readily eat rhubarb plants. The leaves contain dramatically higher oxalate concentrations than the stalks, but both are dangerous for rabbits. Even small amounts of rhubarb leaf can be lethal to a rabbit. Cooked rhubarb (as in pie) has reduced but not eliminated oxalate levels and should also be avoided.
Negative Signs
* Drooling and pawing at the mouth (oxalates burn oral tissues)
* Complete loss of appetite
* No droppings or very small, misshapen droppings
* Lethargy — your rabbit may sit hunched and motionless
* Teeth grinding (bruxism — a clear sign of pain)
* Swollen or painful abdomen
* Decreased or absent urination (kidney involvement)
FAQ
Q: My rabbit has access to the garden where rhubarb grows. Is that safe?
A: No. Fence off the rhubarb completely or remove it. Rabbits will eat it given the chance, and even a small amount of leaf can be fatal. This is one of the most dangerous garden plants for rabbits.
Alternatives
For leafy greens, stick to rabbit-safe options like romaine lettuce, cilantro, parsley, dandelion greens, or basil. These provide the foraging satisfaction your rabbit craves without any of the danger.
Risks & Disclaimer
If your rabbit ate rhubarb leaves, this is an emergency — call your vet immediately. Stalk exposure is also serious. Do not wait for symptoms. Kidney damage can progress rapidly and may be irreversible by the time you see obvious signs.
