Kennel cough
Both viral and bacterial causes of kennel cough are spread through the air by infected dogs sneezing and coughing.  It can also be spread through contact with things that have the bacteria or virus on them.  It can still be spread days or weeks after symptoms disappear.  Symptoms  usually begin about 3 to 5 days after the dog is around the infected animal or object.  The disease can turn into pneumonia.