When evaluating a dog with suspected laryngeal paralysis, what is the primary diagnostic procedure?

• A. Thoracic radiographs
• B. Otoscopy
• C. Blood pressure measurement
• D. Laryngoscopy to visualize the laryngeal apparatus during inspiration

Answer: (D)

Direct visualization of how the larynx moves during inspiration is the key to diagnosing laryngeal paralysis. Laryngoscopy lets you observe the arytenoid cartilages and vocal folds as they should abduct with each breath; in true laryngeal paralysis, the arytenoids fail to abduct or do so inconsistently, causing inspiratory airway obstruction and the characteristic noise. This dynamic assessment confirms the diagnosis and helps distinguish it from other airway issues. Radiographs can show secondary changes or other problems but don’t prove laryngeal dysfunction. Otoscopy inspects the ear, not the larynx, and blood pressure measurements don’t evaluate laryngeal movement.