PTH and familial dilated cardiomyopathy: Although hyperphosphatemia has not been previously cited as a cause of DCM in dogs, it has been associated with myocardial hypertrophy, bone restructuring, and possibly reduced hematocrit in parathyroid hormone-treated, parathyroidectomized and 5/6 nephrectomized Wistar rats fed high-P (1.2%, Ca:P 0.58) diets [39].