The purpose of the study was to compare and estimate the most suitable diagnostic approaches for thoracoscopy examination of thoracic cavity in dogs. 30 animals were used in the project. All dogs were divided in three groups. In the first group thoracoscop was inserted at 1/3 upper part of V and VIII intercostal spaces on left side. In the second group approaches were performed at the middle line of the right V and VIII intercostal spaces. In the third group paraxiphoid portals on left and right sides were used. The obtained results showed that all approaches had diagnostic value, but the most valuable was paraxiphoid one and it allows for examination the whole chest using one portal.

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