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Dog Flu in the UK: Symptoms, Treatment and Prevention

Dog flu — canine influenza — has been making headlines in the UK as cases rise and pet owners grow more aware of the risk. While not as well established in the UK as in the USA, veterinary professionals are increasingly monitoring for canine respiratory illness. Understanding the symptoms and knowing when to seek treatment is vital for any dog owner.

What Is Dog Flu?

Canine influenza is a highly contagious respiratory infection caused by influenza A viruses. Two strains are most commonly discussed: H3N8 and H3N2. In the United States, both strains have caused significant outbreaks. In the UK, true canine influenza remains rare, but the broader category of Canine Infectious Respiratory Disease Complex (CIRDC) — colloquially known as 'kennel cough' — is common and encompasses several viral and bacterial pathogens with similar symptoms.

In 2023–2024, an unusual surge in canine respiratory illness was reported across the USA, prompting concern among UK vets about potential importation risk, particularly through the pet travel scheme. The British Veterinary Association (BVA) issued guidance encouraging vigilance and reminding owners that dogs travelling internationally should be fully vaccinated against known respiratory pathogens.

For UK purposes, the most relevant infections within CIRDC include Bordetella bronchiseptica (the primary kennel cough bacterium), canine parainfluenza virus, canine respiratory coronavirus, and canine adenovirus. These can occur alone or in combination, causing illness that ranges from mild to severe.

Understanding what your dog has been vaccinated against, and staying up to date with boosters, is the most effective defence against the majority of canine respiratory infections currently circulating in the UK.

Symptoms of Dog Flu and Respiratory Illness

The classic signs of canine respiratory illness include a persistent, honking or hacking cough, nasal discharge, sneezing, lethargy, and reduced appetite. In mild cases, dogs remain bright and active despite the cough. In more severe cases, fever, difficulty breathing, and significant lethargy may develop.

Most healthy adult dogs recover from mild kennel cough-type illness within one to three weeks without specific treatment. However, puppies, elderly dogs, brachycephalic breeds (those with flat faces, such as Bulldogs or Pugs), and immunocompromised animals are at higher risk of complications including pneumonia.

Signs that warrant urgent veterinary attention include rapid or laboured breathing, blue-tinged gums, collapse, refusal to eat for more than 24 hours, or a high fever. If your dog has been recently rehomed from abroad or has attended a boarding facility or dog show, mention this to your vet as it helps them assess the likelihood of exposure to rarer pathogens.

Never give your dog human flu remedies or over-the-counter medications without veterinary guidance — many human medicines, including some containing xylitol or ibuprofen, are toxic to dogs.

How Dog Flu Spreads

Canine respiratory infections spread primarily through direct contact between dogs, through airborne droplets from coughing and sneezing, and through contaminated surfaces such as water bowls, leads, and hands. Environments where dogs congregate — kennels, dog parks, groomers, dog shows, and training classes — carry the highest transmission risk.

Unlike human flu, dog flu does not typically spread to cats or people — it is not a zoonotic disease under normal circumstances. However, you can inadvertently transmit the virus between dogs on your hands or clothing if you have been in contact with an infected animal.

If your dog is diagnosed with a respiratory infection, follow your vet's advice on isolation. Most vets recommend keeping infected dogs away from other dogs for at least two weeks, and informing any kennels or dog walkers you use. Responsible reporting helps reduce community spread.

Boarders and daycare facilities should ask for proof of kennel cough vaccination before accepting dogs. If a facility does not ask to see vaccination records, this is a red flag worth noting when choosing where to board your pet.

Treatment and Vet Costs

Treatment for mild canine respiratory illness is primarily supportive: rest, ensuring adequate hydration, and monitoring for deterioration. Your vet may prescribe antibiotics if a bacterial component such as Bordetella is suspected or confirmed, and anti-inflammatory medication to reduce fever and improve comfort.

A standard consultation to assess a coughing dog typically costs £40–£65. If chest X-rays are needed to rule out pneumonia, expect to pay £150–£300 additionally. Blood tests may also be recommended, adding a further £80–£150. Dogs that develop pneumonia may require hospitalisation at £300–£1,500 per night, so illness that initially seems minor can become expensive.

The kennel cough vaccine (Bordetella/parainfluenza intranasal vaccine) costs around £25–£40 and is widely recommended for social dogs. While it does not cover every possible respiratory pathogen, it significantly reduces the severity of the most common infections. Annual boosters are typically required, and most boarding kennels insist on up-to-date vaccination.

If your dog is insured, respiratory illness is usually covered under standard accident and illness policies. Check your policy's waiting period — most require 14 days before new conditions are covered.

Stay Prepared with CompareMyVet

Knowing your local vet's availability and consultation fees before your dog falls ill is excellent preparation. CompareMyVet helps you compare practices in your area, see their prices for standard consultations, and find emergency out-of-hours options at app.comparemyvet.uk.

With the CMA's 2026 reforms requiring vets to publish their prices openly, comparing costs has never been easier. If you are looking for a vet that offers kennel cough vaccinations at a competitive price, or one with convenient out-of-hours access, our comparison tool makes it straightforward to find the right practice for your dog.

You can also read more on our guide to comparing local vets to understand what to look for beyond price alone.