Abstract
A two-year-old spayed female toy poodle weighing 3.7 kg was presented with cardiac murmur. A grade IV/VI systolic murmur was auscultated, loudest at the left and right cardiac base. Echocardiography showed severe left ventricular outflow tract obstruction and increased pressure gradient (127 mmHg). On the basis of these findings, the dog was presumptive diagnosed with severe subaortic stenosis or dynamic left ventricular outflow tract obstruction, and Carvedilol was prescribed. Two months after medical management was started, pressure gradient was improved drastically (8.8 mmHg), and cardiac murmur was disappeared. This case was considered that one of the dynamic left ventricular outflow tract obstruction that could be diagnosed during follow-up.
