The ductus arteriosus is an arterial shunt between the aorta and a pulmonary artery, physiological during fetal development, during this period it shunts away part of the blood circulation that would go to the lungs, which at that moment are still afunctional. After birth, there is a physiological closure of this duct, its non-occlusion is called persistent ductus arteriosus (PDA), which is treated surgically. We report the clinical case of a female canine of the German dwarf spitz breed that was diagnosed with PDA in a routine pediatric pre-vaccination consultation. Doppler echocardiography was then performed with confirmation of PDA. Treatment consisted of surgical correction using the standard technique of ligation of the patent ductus arteriosus. The procedure was successful with the patient's recovery.