A particular problem for which there is no total preventative control is kennel cough, an infectious inflammation of the larynx and trachea. Kennel cough may not be the best description. The disease is transmitted by droplets coughed into the air by dogs actively suffering from the illness. Somewhat close contact between dogs is necessary for transmission, such as nose-to-nose greeting through the wires at dogs's kennels. At least as common, a cause is dogs meeting at training classes, the vet, or anywhere where dogs meet and are close together.
Kennel cough is caused by a mixture of infectious agents. The most effective vaccine, although it still does not include every possible component of the infection, is given as a nasal spray.