Oh good dust from food etc can cause coughing so good you found the culprit.Update on the coughing. I think we found the problem. I have their broader next to an air intake for my AC and Heat it has alot of dust on it. I think they got the dust and stuff stuck in their throats. So I have them a bath cleaned the dust off and waiting but they seem to be doing better already. It was like she was coughing and then ate whatever she coughed up