A. Cough may be caused by different reasons than infectious kennel cough.
Kennel cough is most of the time a self limiting disease, which resolves in few days if not complicated by any other concurrent disease or does not affect immunocompromised animals.
If the cough is resolving by itself I would not do anything else in terms of treatment.
If signs come back I would recommend to take her to your veterinarian for a check up.
Thorough clinical examination and radiographs of the chest are needed to identify the underlying cause. Respiratory and heart diseases are the most common causes of it.
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