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Dogs cough for a variety of reasons, some of which can be serious in themselves and others that are signs of an underlying problem. Internal parasites, heartworm disease, distemper, fungus diseases, tuberculosis, allergies, and pollutants such as cigarette smoke can cause Fido to cough.
Inflammation within airways causes chronic cough and excessive mucus production. Because, dogs canât expectorate (spit), it is not always easy to know if the dog is making increased airway mucus. Therefore, the diagnosis of CB is usually based on chronic cough alone.