Lenny is a 3 months old puppy that had a heart murmur since birth. He was diagnosed with a congenital condition called Patent Ductus Arteriosus (PDA). PDA is the failure of a large blood vessel, the ductus arteriosus, to close just after birth. This defect usually results in left sided congestive heart failure and pulmonary edema with a mortality rate of over 50% before one year of age if left…