Patent Ductus Arteriosus (PDA) is one of the most common congenital heait defects of dogs. Clinical signs commonly observed with this condition can range from asymptomatic to severe congestive heart failure (pulmonary edema). Physical exam findings are commonly correlated with how much blood flows through the PDA and into pulmonary circulation.A high-grade, continuous ("machinery") heart murmur with bounding femoral pulses in a young dog (usually