The present case describes a dog with eosinophilic bronchopneumonia. The dog was presented with ahistory of coughing and dyspnea at the Department of Small Animal Medicine, Faculty of VeterinaryMedicine, Ghent University. A presumptive diagnosis of Pneumocystic carinii was made based onsignalment, history, clinical examination, blood work and medical imaging, and the dog was treated withtrimethoprim-sulfadiazine. Because of lack of improvement, a bronchoalveolar lavage was performed andthe serum IgG and IgM concentrations were determined. Cytology of bronchoalveolar lavage showed anexcessive amount of eosinophils. The IgG was within normal limits and the IgM was increased. Thesefindings excluded pneumocystosis as a possible cause, and the definitive diagnosis of eosinophilicbronchopneumonia was made. Prednisolone was added to the treatment. The dog was sent home with atreatment of trimethoprim-sulfadiazine and prednisolone gradually diminished. On control, six weekslater, the dog only coughed occasionally, and another three months later it was free of coughing.