Kennel cough produces a dry, hacking, occasionally productive cough, which may persist for a long time. It is highly contagious and your dog should be seen by a veterinarian. And yes, please inform the front desk staff about your dog's cough, so the staff can usher you into an exam room asap, directly from the car, to avoid the waiting room. Also, know that other contagious agents, like parainfluenza, a virus, can cause a cough. Both bordetella and parainfluenza can be avoided by vaccination.