[What is your diagnosis? Chronic cough and fever in a female dog]

Crenosomiasis is a pulmonary parasitic disease of the dog, endemically occurring in Switzerland, which is to differentiate from other forms of therapy-resistant chronic cough. The diagnosis is obtained by fecal examination (larval migration, Bearman's technic) or by cytologic examination of the tracheobronchial mucus. Levamisole is the drug of choice for the treatment of this disease.