In this VETgirl online veterinary CE podcast, we review patent ductus arteriosus (PDA). Left-to right patent ductus arteriosus (PDA) is the most common congenital heart defect in dogs. PDA also occurs in cats but with much lower incidence. If PDA is left untreated, it results in left-sided volume cardiac overload, with a high incidence of congestive heart failure (CHF) within the first year of life. Definitive treatment usually carries a good prognosis and consists of attenuation of flow across the PDA by either surgical ligation (e.g., via thoracotomy) or placement of occlusion devices (e.g., such as coils, plugs or occluders) from within the vascular space via a transcatheter/transvascular approach. Both methods are highly successful in dogs, with transvascular methods preferred as they are less invasive and have a lower rate of major complications. So what about cats? Unfortunately, these approaches can both be more difficult in cats due to their small size. To date, minimal data exists in veterinary literature about correction of PDAs versus medical management in cats.