Yes, there are different strains of canine influenza. The United States typically sees two prevalent canine flu strains, H3N8 and H3N2. These strains exhibit high contagion rates and can induce flu-like symptoms in dogs, such as coughing, nasal discharge, fever, lethargy, and decreased appetite. Dog guardians must stay informed about these strains, given their potential for rapid transmission, particularly in locations like parks and kennels. Vaccination options are accessible to safeguard dogs against these strains, and dogs in regions with elevated risk or those with frequent canine interactions should consider this preventive measure.