Kennel Cough Explained: Contagion, Course and Care

Kennel cough, more formally infectious tracheobronchitis, is a highly contagious airway infection that spreads wherever dogs congregate closely, from boarding kennels to dog parks and training classes. It is rarely a single pathogen but a complex involving Bordetella bronchiseptica, canine parainfluenza virus and sometimes canine adenovirus type 2 acting together on irritated airway tissue. Most cases are self-limiting, but the harsh, honking cough can persist for weeks and occasionally progresses in vulnerable dogs.

The Infectious Complex Behind the Cough

Bordetella bronchiseptica attaches to cilia lining the trachea and bronchi, paralysing their sweeping action and allowing mucus and debris to accumulate. This sets the stage for secondary viral or bacterial invaders to inflame the airway lining further, producing the characteristic dry, paroxysmal cough that many owners describe as a goose honk or a reaction to something stuck in the throat.

Transmission occurs through aerosolised droplets and contaminated surfaces such as water bowls and toys, meaning close confinement in kennels, shelters and grooming salons dramatically increases exposure risk within an incubation period of two to fourteen days.

Recognising the Classic Cough

• A dry, harsh cough easily triggered by neck pressure from a collar
• Retching or gagging that sometimes produces white foam
• Mild lethargy or reduced appetite for one to two days
• Nasal discharge without significant fever in uncomplicated cases
• Cough that worsens with excitement or exercise

Most affected dogs remain otherwise bright and continue eating normally, which is a useful way to distinguish straightforward kennel cough from more serious respiratory disease that warrants urgent review.

How Vets Confirm the Diagnosis

Diagnosis is usually clinical, based on a compatible cough in a dog with recent exposure to other dogs, since the honking character combined with a normal chest auscultation is distinctive enough to avoid extensive testing. When signs are severe, prolonged beyond two to three weeks, or accompanied by fever, vets may run PCR panels on a pharyngeal swab to identify the specific organisms involved.

Chest radiographs are reserved for dogs showing signs of pneumonia, such as laboured breathing or crackles on auscultation, to rule out progression beyond the upper airway into the lungs.

Supportive Care and Antibiotics

Uncomplicated kennel cough is managed supportively, since most cases resolve within one to three weeks without antibiotics.

• Cough suppressants such as butorphanol for dogs with disruptive paroxysms
• Antibiotics like doxycycline reserved for confirmed bacterial or secondary infection
• Switching from a neck collar to a harness to reduce tracheal irritation
• Rest in a warm, humidified room away from other dogs for two weeks

Preventing Spread at Home and in Kennels

Isolation is the single most effective control measure, since a coughing dog can shed Bordetella for weeks after clinical signs resolve, so keeping infected dogs away from communal areas protects the wider dog population. Bordetella and parainfluenza vaccines, given intranasally, orally or by injection, reduce both the incidence and severity of disease and are frequently required by boarding facilities.

Puppies, brachycephalic breeds and dogs with pre-existing heart or lung disease are more prone to complications, so extra vigilance and earlier veterinary review are warranted in these groups even when the cough initially looks mild.

When to seek help urgently

• Laboured or rapid breathing at rest
• Green or yellow nasal discharge with fever above 39.5°C
• Complete loss of appetite lasting more than 24 hours
• Blue-tinged gums indicating inadequate oxygenation

Kennel cough is usually a nuisance rather than a crisis, but persistent, worsening or complicated coughs deserve a proper veterinary assessment to rule out pneumonia or other underlying disease.