Noticing what time of day your dog coughs can help determine the cough's cause. [substeps] Coughing during the night can be caused by congestive heart failure, fluid buildup in the lungs, or tracheal collapse.
[header] How to diagnose coughing in dogs [title] Notice what time of day the coughing occurs. [step] Coughing in dogs has many causes, including heart disease. The cough is a symptom and can't always be used to determine the cause; however, certain conditions do have distinctive types of cough, which can help point towards the source of the problem.