There are severe interstitial infiltrates throughout all the lung fields.  There are alveolar infiltrates in the dependent portion of the right middle lung lobe, and the caudal part of the left cranial lung lobe.
There is some gas in the esophagus. The cardiovascular structures are normal. These findings are suggestive of bacterial pneumonia, possibly due to aspiration.
The dog responded well to antibiotics. The history was suggestive of laryngeal paralysis, a diagnosis that was confirmed by examination if the larynx under light anesthesia.

Discussion:
Laryngeal paralysis is a disorder in which the nerves that control the muscles and cartilage that open and close the larynx do not function properly, resulting in voice changes and difficulty with eating or breathing.
Laryngeal paralysis is mostly seen in older, large breed dogs such as Labrador Retrievers, Golden Retrievers, Saint Bernard, and Siberian Huskies. The larynx is normal at birth, and over time, the nerves and muscles that control the laryngeal cartilages lose their normal function. Most of these case are idiopathic.

Laryngeal paralysis can also occur less commonly as a hereditary condition in puppies. The signs of breathing difficulty will usually be seen by 2 to 6 months of age. Laryngeal paralysis can also be the result of damage to the nerves and/or muscles of the larynx due to trauma, and in some cases it is related to hypothyroidism.