Comment posted May 30 2015

Even if his HR is within normal limits, and there is no H murmur on auscultation, the H seems enlarged, and measuring the VHS could be of help, I would suggest. I would not rule out a DCM, as there is no H murmur either. Being dyspneic, trying to assess if the respiratory effort  is during inspiration or expiration can be challenging, but that may assess if there is either upper (inspiratory) or lower pulmonary track disorder. As you mention the animal is aggressive I guess that a proBNP is not an option, though I would want to request it. Hope that helps.