Patent Ductus Arteriosus in the Dog (PDA) | Congenital Heart Disease. Diagram showing abnormal flow from the aorta (AO) to the pulmonary artery (PA) across. CAUSE: Patent ductus arteriosus (also called PDA) is a birth defect in the heart. It is caused by incomplete changes in the heart's circulation when a dog or cat is. The most common congenital heart disease of the dog is a patent ductus arteriosus or a PDA. In dogs, the condition is relatively common and. Once the blood has been oxygenated by the lungs, it then returns to the left side of the hearty through the pulmonary veins to be pumped out into the body by the aorta. Find a Veterinary Specialist. The condition or pda heart in dogs described in this medical article can affect both dogs and cats. Once the patent ductus arteriosus has become a right to left shunt or a reverse PDA, surgery is no longer possible. We've sent an email with instructions to create a new password. As a consequence, a portion of the blood that should be carried to the body will be diverted through this communication into the pulmonary artery and will go into the lungs again instead of bagheera french body.