A four-year-old dachshund presented with a two-week history of pyrexia, depression, and
cough. Four months earlier, the owner observed the dog swallow a whole popsicle stick, but
the animal showed no clinical signs at that time. Radiography, ultrasonography, and
computed tomography confirmed an intrathoracic linear foreign body and pleural effusion in
the right thorax. The pleural fluid was bloody and purulent, and contained inflammatory
cells and Escherichia coli. The dog was diagnosed with pyothorax induced
by a foreign body, and was treated successfully by surgical removal of the foreign body,
partial lung lobectomy, thoracic lavage, and antibiotics. The foreign body was identified
as a popsicle stick that the dog had eaten.