What radiographic pattern is most typical of bacterial pneumonia in dogs, and how would you differentiate it from edema or atelectasis?

• A. Alveolar infiltrates that are focal to multilobar, often cranioventral; edema is perihilar/ caudodorsal; pneumonia shows air bronchograms.
• B. Diffuse interstitial pattern; edema; none.
• C. Cavitary lesions in the periphery.
• D. No radiographic changes.

Answer: (A)