2c260acc_n_for_Animals__Cardiac_Disease__Congenital_Defect
[Typical Auscultatory Features] Variablea systolic murmur at the left base is often detected; cyanosis is an important clinical sign Abnormal anatomy related to the cardiac malformations examples include: tetralogy of Fallot, patent ductus arteriosus with pulmonary hypertension, pulmonary or tricuspid valves stenosis with atrial septal defect. Right to left shunting may be documented by Doppler techniques and/or by contrast echocardiography. [Congenital Defect] 
Right to left cardiac shunt
Orthopedic Foundation for Animals: Cardiac Disease
Congenital Defect