There are two strains of CI, both of which appear in dogs across the U.S. The first strain of CI started in 2004 as an H3N8 influenza A virus, identified when an outbreak occurred among racing Greyhounds in Florida. H3N8 was closely related to an equine virus that has been around for more than 40 years. Researchers believe that this equine influenza mutated, jumped species, and became the canine influenza strain.
Then, in 2015, H3N2, a new canine influenza virus, arrived on the scene. Although it was genetically identical to a previous H3N2 strain found in Asia, this new influenza strain was the result of avian influenza that likely started in live bird markets. This new strain is responsible for canine flu outbreaks in the Midwest part of the U.S. in 2015 and 2016 and then spread across the U.S.
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