Dog Canine Influenza Welfare | Animal Welfare Hub

Canine influenza (dog flu) is an emerging respiratory infection that can spread rapidly through dog populations. Understanding prevention and management protects individual dogs and communities.

Key Facts

Two strains of canine influenza circulate in the US: H3N8 (equine origin) and H3N2 (avian origin, emerged 2015)
Morbidity is high - nearly all exposed dogs develop infection - but mortality is low (less than 10%) in most outbreaks
Dogs show coughing, nasal discharge, lethargy, and fever lasting 2-3 weeks
Outbreak control requires isolation of affected dogs and temporary closure of high-contact facilities
Vaccines are available for both H3N8 and H3N2 and are recommended for dogs in high-exposure environments

Welfare Considerations

Canine influenza causes 2-3 weeks of respiratory illness that, while rarely fatal, is genuinely uncomfortable - persistent coughing, fever, and malaise impair normal behavior and sleep. Dogs in daycare, boarding, and dog park environments face elevated exposure risk. Outbreak management through isolation of symptomatic dogs protects the wider community but stresses isolated individuals through social deprivation. Vaccination reduces severity and duration of illness in vaccinated dogs. Facilities with clear influenza protocols - including isolation areas and transparent communication with owners - provide the best welfare protection during outbreaks.

What You Can Do

Vaccinate dogs with high social exposure against both H3N2 and H3N8 strains before peak seasons
Report respiratory illness to your boarding, daycare, or dog park facility to enable outbreak identification
Keep unwell dogs home and isolated from dog parks and communal facilities until 7 days after symptoms resolve
Follow veterinary guidance on quarantine duration during known local outbreaks