Why Are Rhubarb Leaves Harmful for Pets?

Rhubarb leaves pack oxalic acid and anthraquinone glycosides that cause severe GI upset, kidney damage, and calcium binding in pets. Ingestion leads to vomiting, diarrhea (often bloody), weakness, tremors, rapid breathing, and potential renal failure. Stalks are safer in tiny amounts, but leaves are highly toxic (a few ounces for small pets). Gardeners, secure plants. Induce vomiting ASAP and seek aggressive vet support with fluids and monitoring.