Can Rabbits Eat Rhubarb? No, It Is Toxic

No, rabbits should never eat rhubarb, because rhubarb is toxic to rabbits and is very high in oxalic acid that can damage their kidneys. The leaves are the most dangerous part of the plant, but the stalks are unsafe too, so no part of rhubarb belongs in a rabbit's diet.

Rhubarb is a common garden plant, which makes it a real risk for free-roaming and outdoor rabbits that can reach a patch. Here is why rhubarb is so harmful, what to do if your rabbit gets into it, and the safe greens to feed instead.

Why Rhubarb Is Dangerous for Rabbits

The core problem with rhubarb is its very high level of oxalic acid, often called oxalates. Oxalates are natural compounds found in small amounts in many plants, but rhubarb contains them in large concentrations. The leaves hold the most, which is why they are considered especially dangerous, but the stalks also contain enough oxalic acid to harm a rabbit. There is no part of the plant that you can safely offer.

Inside the body, oxalates bind to calcium, which causes two kinds of harm. They interfere with how the body uses calcium, and the resulting compounds can damage the kidneys, an organ rabbits rely on to filter their blood. Oxalate poisoning in a rabbit can show up as tremors, twitching, drooling, lethargy, and a swollen or sore mouth from the irritating nature of the plant. In severe cases, especially in a small rabbit that ate a meaningful amount, the poisoning can be fatal.

What makes rhubarb particularly risky is where it grows. Rhubarb is a popular garden crop, often planted in beds and borders that an outdoor or free-roaming rabbit can wander into. The big, leafy plant can look like an inviting green snack to a grazing rabbit. If you grow rhubarb, fence it off completely or keep your rabbit well away from the patch, and never assume a rabbit will know to avoid it on its own.

What to Do If Your Rabbit Ate Rhubarb

If your rabbit has eaten any rhubarb, leaves or stalks, treat it as an emergency and contact an exotic or rabbit-savvy vet right away. Do not wait to see whether symptoms develop, because oxalate poisoning can progress and the kidneys can be affected before the rabbit looks clearly unwell. Call the clinic, tell them what was eaten and roughly how much, and follow their instructions. If your usual vet is closed, ask for the nearest emergency exotic service.

While you arrange care, watch your rabbit closely for warning signs. Look for tremors, twitching, drooling, and a swollen or sore mouth, which point to the oxalate effect. Watch also for lethargy and for a rabbit that has stopped eating and stopped producing droppings, a sign the gut is shutting down and an emergency in its own right. Do not attempt home remedies or try to ride it out. The safest course is prompt professional care, and the sooner the better.

What Rabbits Can Eat Instead

A healthy rabbit diet is built on unlimited grass hay, such as timothy or orchard hay, which should make up roughly 80 percent of everything your rabbit eats each day. Hay keeps the digestive system moving, wears down continuously growing teeth, and gives your rabbit safe, satisfying chewing all day long. Pair the hay with fresh water and a measured portion of a quality pellet.

For fresh food, choose safe low-oxalate greens rather than anything from the rhubarb family. Good options include romaine and other leaf lettuces, cilantro, and basil, with herbs like parsley offered in moderation since they are higher in oxalates. Rotate several different greens through the week so no single nutrient builds up, wash everything well, and introduce any new green slowly in small amounts. These safe choices give your rabbit fresh variety without the danger rhubarb carries.

What About Baby Rabbits?

Baby rabbits are even more vulnerable to rhubarb than adults, so the answer for them is an even firmer no. Young rabbits have delicate digestion that is still establishing its gut bacteria, and their small bodies are overwhelmed more easily by a toxin like oxalic acid. A baby rabbit should have only unlimited hay, an age-appropriate pellet, and fresh water until around 12 weeks of age. After that, you can begin introducing safe low-oxalate greens one at a time in tiny amounts, watching the droppings closely. Rhubarb is never appropriate at any age, so keep it fenced off or stored where no rabbit, young or old, could reach it.

The Bottom Line

Can rabbits eat rhubarb? No, never. Rhubarb is toxic to rabbits because it is very high in oxalic acid, with the leaves being especially dangerous and the stalks unsafe too. Those oxalates bind calcium and can cause kidney damage, tremors, twitching, drooling, lethargy, and a swollen or sore mouth, and in severe cases the poisoning can be fatal. Because rhubarb grows in so many gardens, keep outdoor and free-roaming rabbits well away from any patch. If your rabbit eats rhubarb, call a rabbit-savvy vet immediately and watch for tremors, lethargy, and a rabbit that has stopped eating and pooping. Stick to hay and safe low-oxalate greens.