Table 2.

Frequency of isolated cardiac anomalies found by the veterinary cardiology specialist as the cause of murmur

Congenital anomaly	Number of dogs
Aortic stenosis	64
Severe	17
Moderate	8
Mild	39
Pulmonic stenosis	59
Severe	41
Moderate	15
Mild	6
Patent ductus arteriosus	44
Left-to-right shunting	41
Right-to-left shunting	3
Mitral valve dysplasia	18
Ventricular septal defect	13
All left-to-right shunting
Tricuspid valve dysplasia	8
Double chambered right ventricle	5
All moderate