DOGS · Condition guide
Influenza in dogs: what real veterinary cases show
Canine influenza, commonly known as dog flu, is a contagious respiratory infection caused by specific influenza viruses, primarily H3N8 and H3N2. It spreads easily among dogs, especially in places like kennels and dog parks, and can lead to symptoms ranging from mild to severe.
Owners often first notice their dogs coughing, sneezing, or having a runny nose. Early detection is crucial because, while many dogs recover with supportive care, some can develop more serious complications like pneumonia.
What vets typically check for
- Physical examination and history taking to assess symptoms.
- Nasal or throat swabs for PCR testing to identify the virus.
- Chest X-rays if pneumonia is suspected.
- Blood tests to check for secondary infections.
- Supportive care including hydration and rest; antiviral medications in severe cases.
Not a replacement for veterinary care. Use this to walk into the conversation prepared, not to self-diagnose.
Real cases from the veterinary literature
Peer-reviewed reports our semantic search surfaces for Canine influenza. Click into any case for the full abstract — or run a personalised search with your pet's exact details.
- Global seroprevalence and prevalence of infection of influenza in dogs and cats: A systematic review and meta-analysis.
Preventive veterinary medicine · 2026
A review of studies found that about 12% of dogs and nearly 2% of cats have been exposed to the influenza A virus. This means that while it's not extremely common, it can still affect pets, especially in certain regions like the Americas and Asia. The prevalence was higher in dogs during the spring and summer months. The researchers noted that there are many factors that could
- A bacteriophage with dual host specificity for canine and porcine Bordetella bronchiseptica: Characterization and biofilm disruption potential.
Virology · 2026 · China
A bacteriophage (a virus that infects bacteria) called PBb001 was found to effectively target Bordetella bronchiseptica, the bacteria responsible for kennel cough in dogs. This bacteriophage was isolated from swine farm wastewater and showed the ability to reduce bacterial growth and disrupt biofilms, which are clusters of bacteria that can be hard to treat. PBb001 could be a p
- Clinical features, risk factors, and outcomes of Bordetella bronchiseptica respiratory infections in dogs diagnosed at a tertiary care institution.
Journal of veterinary internal medicine · 2026 · United States
A group of 59 dogs, including many Cavalier King Charles Spaniels and Yorkshire Terriers, were diagnosed with Bordetella bronchiseptica, a serious respiratory infection. Most of these dogs showed symptoms for about 30 days, with nearly 40% suffering from severe cases like pneumonia. Some dogs had other respiratory issues that made their infections harder to treat. While co-infe
- Diagnostic limitations of oropharyngeal swab cultures and inconsistent presence of secondary bacterial infection in canine aspiration pneumonia.
Journal of the American Veterinary Medical Association · 2026
A group of 30 dogs diagnosed with aspiration pneumonia (AP) showed symptoms like coughing and fever, often after vomiting or regurgitating. The study found that swabs taken from the throat (oropharyngeal swabs) often showed more bacteria than samples taken from the lungs (bronchoalveolar lavage fluid), with most bacteria from the throat not being present in the lungs. Interesti
- Increased neutrophil extracellular traps formation in the bronchoalveolar lavage fluid of dogs with bronchiectasis.
Frontiers in veterinary science · 2026
A 7-year-old Beagle was brought in for chronic coughing and breathing problems, which were diagnosed as bronchiectasis, a condition affecting the airways. Tests showed increased levels of neutrophil extracellular traps (NETs) in the fluid from the lungs, indicating inflammation and potential infection. While the presence of NETs suggests they may contribute to the disease, the
- Nasal histological findings in asymptomatic control dogs and in dogs with chronic inflammatory rhinitis.
Veterinary pathology · 2026
A group of dogs with chronic nasal issues, known as chronic inflammatory rhinitis (CIR), showed significant changes in their nasal tissue compared to healthy dogs. The study found that dogs with CIR had higher levels of certain immune cells in their nasal lining, indicating inflammation. Additionally, their nasal tissue was thicker and had fewer cilia, which are tiny hair-like
Frequently asked questions
- How does canine influenza spread?
- Canine influenza spreads through respiratory droplets when an infected dog coughs or sneezes. It can also spread via contaminated objects like food bowls or leashes.
- Can my dog get vaccinated against influenza?
- Yes, there are vaccines available for both H3N8 and H3N2 strains. Vaccination can help reduce the severity of symptoms and the spread of the virus.
- Is canine influenza dangerous?
- While most dogs recover with proper care, some can develop severe respiratory illness or secondary infections like pneumonia. Early treatment can help prevent complications.