Kennel cough
Kennel cough, "canine infectious respiratory disease complex" or "canine infectious tracheobronchitis" ) is an upper respiratory infection affecting dogs. There are multiple causative agents, the most common being the bacterium Bordetella bronchiseptica, followed by canine [parainfluenza virus], and to a lesser extent canine coronavirus. It is highly contagious; however, adult dogs may display immunity to reinfection even under constant exposure. Kennel cough is so named because the infection can spread quickly among dogs in the close quarters of a kennel or animal shelter.
Viral and bacterial causes of canine cough are spread through airborne droplets produced by sneezing and coughing. These agents also spread through contact with contaminated surfaces. Symptoms begin after a several-day incubation period post-exposure, and in most cases will clear up on their own. However, in young puppies or immunocompromised animals, mixed or secondary infections can progress to lower respiratory infections such as pneumonia.
Symptoms
The incubation period is 5–7 days. Symptoms can include a harsh, dry cough, retching, sneezing, snorting, gagging or vomiting in response to light pressing of the trachea or after excitement or exercise. The presence of a fever varies from case to case.Types
Although kennel cough is considered to be a multifactorial infection, there are two main forms. The first is more mild and is caused by B. bronchiseptica and canine parainfluenza infections, without complications from canine distemper virus or canine mastadenovirus A. This form occurs most regularly in autumn, and can be distinguished by symptoms such as a retching cough and vomiting. The second form has a more complex combination of causative organisms, including CDV and CAV. It typically occurs in dogs that have not been vaccinated and it is not seasonal. Symptoms are more severe than the first form, and may include rhinitis, conjunctivitis, and fever, in addition to a hacking cough.Transmission
Viral infections such as canine parainfluenza or Canine respiratory coronavirus are only spread for roughly one week following recovery; however, respiratory infections involving B. bronchiseptica can be transmissible for several weeks longer. While there was early evidence to suggest that B. bronchiseptica could be shed for many months post-infection, a more recent report places detectable nasal and pharyngeal levels of B. bronchiseptica in 45.6% of all clinically healthy dogs. This has potentially expanded the vector from currently or recently infected dogs to half the dog population as carriers. To put the relative levels of shedding bacteria into perspective, a study analyzing the shedding kinetics of B. bronchiseptica presents the highest levels of bacterial shedding one week post-exposure, with an order of magnitude decrease in shedding observed every week. This projection places negligible levels of shedding to be expected six weeks post-exposure. Dogs which had been administered intranasal vaccine four weeks prior to virulent B. bronchiseptica challenge displayed little to no bacterial shedding within three weeks of exposure to the virulent strain.Treatment and prevention
s are given to treat any bacterial infection present. Cough suppressants are used if the cough is not productive. NSAIDs are often given to reduce fever and upper respiratory inflammation. Prevention is by vaccinating for canine adenovirus, distemper, parainfluenza, and Bordetella. In kennels, the best prevention is to keep all the cages disinfected. In some cases, such as "doggie daycares" or nontraditional playcare-type boarding environments, it is usually not a cleaning or disinfecting issue, but rather an airborne issue, as the dogs are in contact with each other's saliva and breath. Although most kennels require proof of vaccination, the vaccination is not a fail-safe preventative. Just like human influenza, even after receiving the vaccination, a dog can still contract mutated strains or less severe cases.In 2024, reports of a “mysterious” canine respiratory disease was reported on the east coast of the United States that could not be identified as one of the dozen known respiratory diseases. This new organism has caused thousands of dogs to become ill and has been fatal to some. Symptoms include runny eyes, sneezing and coughing but should not be confused with kennel cough.