Here's what my friend Google says about Curly Dock:
Toxicity. Curly dock contains soluble oxalates that can cause a significant decline in the accessibility of calcium and magnesium to an animal that ingests it. This disrupts the function of cell membranes and in severe poisonings leads to muscle tremors, weakness, kidney failure, and death.
Toxicity. Curly dock contains soluble oxalates that can cause a significant decline in the accessibility of calcium and magnesium to an animal that ingests it. This disrupts the function of cell membranes and in severe poisonings leads to muscle tremors, weakness, kidney failure, and death.