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Kennel cough has a incubation period of 2 weeks, so this is a big issue. Typically once antibiotics are started the dog is only contagious for the first week. If it has been over a week then there is no reason to be concerned.
However, since an infected dog will not begin coughing for approximately 7 days after it has picked up the disease, any dogs that come in contact with it during that time may already have picked up the disease and should be observed carefully for any signs of this disease.