Description: Rickets in the fox induced by feeding a calcium deficient diet. Calcium deficiency, phosphorus deficiency, an imbalance in the calcium and phophorus concentrations in the ration, or a deficiency of vitamin D can all cause Rickets in the young growing animal. These deficiencies cause low blood concentrations of calcium and/or phosphorus and prevent the deposition of these minerals for normal bone formation. Symptoms include misshapen long bones, enlarged joints, and lameness. The bones are weak, easily broken, and the legs may be bowed.