While the stems are safe to be eaten by your dog, rhubarb leaves can cause serious excessive salivation, lethargy, and even kidney failure.Click to see full answer. Simply so, what happens if a dog eats rhubarb?Rhubarb is toxic to dogs and cats. The leaves can cause vomiting, diarrhea, and irritation of the mouth (increased salivation or drooling, pawing at mouth).Subsequently, question is, can I give my dog Rhubarb? Rhubarb Another one of our commonly home grown fruits which can be toxic to dogs is rhubarb which again can cause damage to the nervous system, kidneys and digestive tract. Symptoms include tremors, seizures and heart problems so don’t let your dog get stuck into your rhubarb crumble or vegetable patch. Beside this, is rhubarb harmful to dogs? Rhubarb greens contain a compound known as oxalic acid (a poisonous crystalline acid) that can cause tremors, kidney failure and coma. Even though this plant does produce delicious fruit, the leaves and stems are highly toxic to dogs. This plant also possesses the calcium oxalate compound.Can rhubarb kill you?Rhubarb leaves contain dangerously high levels of oxalic acid which can cause serious kidney damage potentially leading to death. Even though a 140 pound person would need to eat about 10 pounds of rhubarb leaves to die, a small amount still has the ability to make a person sick.