A 5-year-old male, neutered Cavalier King Charles Spaniel presented to the Cornell University Hospital for Animals (CUHA) Cardiology Service on May 22, 2013 after his referring Veterinarian diagnosed him with a grade III-IV/VI left sided systolic heart murmur. He was over conditioned but otherwise a healthy dog. An Echocardiogram was performed which revealed degenerative valve disease and a small Patent Ductus Arteriosus (PDA) with a left to right flow. This paper will review the details of this case and discuss the pathology and predilection of a PDA as well as treatment options and prognosis for various patients, including those with chronic valve disease.