(a) A dorsoventral radiograph depicts a 4-year-old spayed female Collie with dysphagia. Alveolar infiltrates with air bronchogram formation are seen in the right cranial and middle lung lobes. (b) A left lateral radiograph of the same dog as in (a) confirms dependent pulmonary infiltrates consistent with aspiration pneumonia in the right cranial (white arrow) and right middle lung lobes. Air bronchogram formation (black arrowheads) and a lobar margin (white arrowheads) define alveolar density in the right middle lung lobe.