Dog flu, also known as canine influenza, is a contagious respiratory infection caused by specific strains of the influenza virus. It primarily affects dogs, leading to symptoms such as coughing, sneezing, nasal discharge, and fever. While most dogs recover within a few weeks, some may develop more severe complications, especially those with pre-existing health issues. The virus spreads easily in places where dogs gather, like dog parks or boarding facilities. Vaccines are available to help protect against certain strains of the virus, making it important for dog owners to consult their veterinarians about vaccination options and preventive measures.