Can Excess Phlegm Cause Dogs To Wheeze?

Can Excess Phlegm Cause Dogs To Wheeze? In bronchitis, inflammation causes the airways to swell and release mucous, ultimately causing the airways to narrow. The main symptom of bronchitis is coughing (an attempt to clear the airways), however, as the condition worsens, dogs will have difficulty breathing and may begin to wheeze when exhaling. Why