The German Shepherd appears to be predisposed to this disorder. Middle aged dogs are most often affected, although younger or older dogs may develop this condition. The fluid obtained at pericardiocentesis is typically sanguineous, non inflammatory, non clotting, and bacteriologically sterile. Pericardiocentesis may effect a permanent cure. In recurrent cases, surgical removal of the parietal pericardium is indicated.
Prognosis is usually good.
In a few cases, constrictive pericarditis has been a sequela. Primary neoplasms of the pericardium are rare. The pericardium is also a very rare site for metastasis from other locations. The right atrium is a frequent primary site of occurrence for this highly malignant tumor in the dog. Most affected dogs are middle aged or older, and there is a definite predilection for German Shepherds.