Enlarged Heart, Heartworm or Collapsed Trachea? What does it sound like to you?

Not to diagnose anything, but our older lab had an enlarged heart and non-cancerous lumps that compressed her airway. She "coughed" daily and it sounded like a hacking noise. Like she got some water down her airway. She was on meds that improved the situation temporarily, but when they came back we decided to put her down. She was 14.