The equine influenza virus, H3N8, has been around for about 40 years, but attention to this illness has increased a lot since 2004 -- when an equine flu virus was found to jump species (from horses to dogs) and begin spreading among dogs. It was first noticed publicly when dogs who raced at greyhound tracks became ill, and is now known as "canine influenza". The equine influenza virus is thought to have mutated, producing the canine influenza virus. To date, there is no evidence of transmission of canine influenza virus from dogs to people.

These canine influenza cases occurred in animal shelters, humane societies, rescue groups, pet stores, boarding kennels, and veterinary clinics -- in other words, anyplace where multiple dogs get together in crowded conditions. Because of some similarity in symptoms, it is often mistaken for "kennel cough".

Canine influenza is a newly recognized virus, and so almost all dogs, regardless of breed or age, are susceptible to infection and have no immunity. So far, most dogs make a full recovery from the flu (the fatality rate is 5% to 8%), and most cases seem to involve the disease in its more mild form. Nevertheless, it is important to consult your veterinarian if you are concerned about the conditions of your dog, especially if your dog has been in contact with many other dogs. You can never be too cautious about protecting your beloved pet! Early care is crucial.

I have listed several very informative web articles below so that you can be more familiar with canine influenza. I strongly recommend that you get a good grasp on what this virus is about and what you can do as a dog owner. Panicking or becoming confused because of a lack of information is the last thing you want to do.

Canine Influenza (Canine Flu)
Control of Canine Influenza in Dogs
Frequently Asked Questions About Canine Flu
Dog Flu -- Cornell CVM
Fast Facts on Canine Influenza