A pulmonary infiltration with eosinophils in a male Husky is described in this paper. The clinical signs, such as dyspnoea and coughing, were present for four days. A diagnosis was obtained by radiography of the thorax and a bronchoalveolar lavage. A treatment of prednisolone was given and resulted in a complete recovery of the patient. The literature on the different techniques to take a sample (the translaryngeal, the transtracheal and the bronchoalveolar lavage), the differential diagnosis, the diagnosis and the treatment are furthermore discussed. A good differential diagnosis is important for a correct prognosis and treatment.