I have heard of a dog flu that is air borne here in the Villages. I know of one pooch which has not been to the Doggie Doo Run Run for about 10 days because of this influenza. A local vet even told the pet owner to keep the sick dog home because of the dozen or so dogs they already had there due to this illness.
This is secondhand information though. I have not actually talked to the dog owner who used to come to the CR101 dog park just about every day before her dog got the flu.
The CDC has this information--
http://www.cdc.gov/flu/canine/