Dog Canine Influenza Prevention | Animal Welfare Hub

Canine influenza virus causes respiratory disease outbreaks at dog facilities, with vaccination and quarantine protocols protecting at-risk populations.

Key Facts

Two canine influenza strains circulate in the US: H3N8 and H3N2
H3N2 emerged in Asia and caused major US outbreaks beginning in 2015
Virtually all exposed dogs develop infection - no natural immunity exists in naive populations
Clinical signs range from mild cough to severe pneumonia and death
Vaccination reduces disease severity but does not prevent infection
The virus spreads through respiratory secretions and environmental contamination
Boarding facilities, dog shows, and dog parks are high-risk transmission settings
Quarantine of exposed dogs for 7-10 days prevents spread to naive populations

Welfare Considerations

Canine influenza outbreaks spread rapidly through boarding facilities and dog parks, potentially affecting hundreds of dogs before an outbreak is recognized. Affected dogs experience fever, productive cough, and in severe cases, hemorrhagic pneumonia. The 100% infection rate in naive populations means a single introduction to an unvaccinated group can cause widespread suffering. Outbreak management requires quarantine measures that affect dogs already stressed by the boarding environment. Vaccination before exposure to high-risk settings is the primary welfare protection.

What You Can Do

Vaccinate dogs against both H3N8 and H3N2 influenza strains before boarding or dog shows
Quarantine new dogs for 7-10 days before introducing to established groups
Report canine influenza outbreaks to local animal health authorities
Choose boarding facilities that require influenza vaccination for all dogs
Seek veterinary care promptly for dogs showing respiratory signs after exposure events