A 1.5 year old, female spayed Australian Shephard dog was presented to the Cardiology Service at the Cornell University Hospital for Animals (CUHA) on 8/04/2009 for evaluation of a left sided heart murmur. Physical examination findings revealed a grade V/IV, continuous murmur with a point of maximal intensity (PMI)over the left cranial hemithorax and a palpable thrill over the left cranial thorax. Echocardiographic imaging revealed a patent ductus arteriosus with accompanying cardiac changes consistent with the onset of heart failure. Radiographic imaging and ECG findings were consistent with a PDA with resultant left-sided cardiac enlargement and the imminent threat of congestive heart failure. A combination of medical and surgical therapies was instituted to address her heart failure and correct the underlying PDA.