Radiographic examination is still a valuable routine procedure for diagnosing cardiopulmonary diseases and assessing their response to treatment. Methodology: In the present study, thoracic radiography was carried out on 47 clinical cases of dogs that suffered from cardiac problem- and five apparently. healthy mongrel dogs that were used as a control for normal radiography of the canine heart. The diseased dogs were of both sexes and of ages that ranged between 45 days and 12 years. Results: The recorded affections were; persistent right aortic arch (2), microcardia (2), left atrial dilatation (6), right ventricular dilatation (9), generalized cardiomegaly (18), pericardial effusion (8), hypertrophic cardiomyopathy (1) and pneumopericardium (1). All radiographic findings of both normal and diseased canine hearts were described. Conclusion: thoracic radiography still constitutes the cornerstone for diagnosing and evaluating cardiopulmonary diseases through providing direct and immediate information about cardiac size and shape, and indirectly through assessing the cardiopulmonary circulation which reflects the degree of heart failure.