Canine flu can spread to other dogs by direct contact with aerosolized respiratory secretions (coughing and sneezing) from infected dogs, by uninfected dogs coming into contact with contaminated objects, and by moving contaminated objects or materials between infected and uninfected dogs. (rosecityvets.com)
The virus can spread by aerosolized respiratory secretions, contaminated inanimate objects, and by people moving between infected and uninfected dogs. (homevet.com)
The virus also can be transmitted person - to - person by aerosolized particles. (health.com)