The symptoms usually appear about 5 - 10 days after exposure to an infected dog and can last for up to 3 weeks, though symptoms may improve considerably within a few days. (thesprucepets.com)
The only way to prevent your pet from contracting kennel cough is to prevent exposure to infected dogs. (vetinfo.com)
Important historical information includes age of the patient (puppies are most susceptible), recent exposure to infected dogs, and overdue or absent vaccines. (web-dvm.net)