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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.
Heartworm disease occurs in both dogs and cats and is most common in parts of the country that have lots of mosquitoes. The age and breed of the pet also influences what causes of cough are most likely. Young animals are more likely to develop a cough due to infections with bacteria or viruses.