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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.
A dog with a cough may be tentatively diagnosed based on the character of the cough itself. For example, a deep, dry, hacking cough that worsens with exercise or excitement is characteristic of kennel cough and typically is caused by the bacterium, Bordetella bronchiseptica.