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Canine H3N8 Influenza - Dog Flu - Disease Risks and Vaccine Information


Sophie's Nose © Janet Tobiassen Crosby DVM

Sophie's Nose

© Janet Tobiassen Crosby DVM
Question: Canine H3N8 Influenza - Dog Flu - Disease Risks and Vaccine Information
Answer: First some background on CIV
The canine H3N8 virus, also called Canine Influenza Virus (CIV), is a relatively new influenza virus in dogs. It causes flu-like symptoms in dogs: coughing, sneezing, and runny nose are the most common clinical signs. Learn more about CIV infection.

This virus jumped from horses to dogs in 2004; it was first discovered in Greyhounds in Florida. A vaccine for this respiratory disease was conditionally approved by the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) in June 2009. Full licensure for the Canine influenza vaccine Nobivac® was granted June 9, 2010. The canine influenza vaccine (CIV) is made by Intervet/Schering-Plough Animal Health from an inactivated (killed) virus.

CIV Transmission
The H3N8 dog flu is a community-based disease. It is highly contagious between dogs and may also be transmitted by our hands, clothing, bowls and tools used between dogs. Please note: this virus is not spread TO people. It is important to isolate sick dogs and use proper sanitation (wash hands, disinfect tools and surfaces) between dogs to reduce chance of transmitting the virus between dogs.

Related: Frequently Asked Questions by Sheltering Organizations - Helpful info for animal care workers and veterinary clinics.

CIV and Lifestyle Risk
The CIV vaccine is a lifestyle vaccine. What does this mean? If you have a dog with a lifestyle that puts him or her at greater risk, you may want to consider vaccination. Dog shows, dog parks, kennels, grooming salons, dog day care centers, anywhere dogs gather may increase risk of CIV infection.

Risk also depends on the prevalence of the virus in the area where you live or travel to. CIV has been reported in several US states and the District of Columbia. (AVMA Canine influenza Update Sept 2009).

Canine influenza is a new (novel) disease. Dogs do not have any natural immunity built up to protect them. According to Cynda Crawford DVM PhD and co-discoverer of the virus, "virtually all dogs exposed to the canine influenza virus become infected; about 80 percent develop a flu-like illness, while another 20 percent do not become ill. Fortunately, most dogs recover within two weeks without any further health complications. However, some dogs progress to pneumonia, which is usually due to secondary bacterial infections."
From the New York Times: 10 Things to Know About the H3N8 Dog Flu

What dogs should get the vaccine?
Due the contagiousness of this virus, some kennels, grooming salons and similar businesses are now requiring this vaccination to prevent an outbreak. Aside from those situations, the decision to vaccinate your dog (or not) should be discussed with your veterinarian, taking into consideration your dog's risks and the CIV prevalence in your area or where you will be traveling to.

Vaccine Facts:

  • The CIV vaccine is manufactured by Intervet/Schering Plough
  • Type: killed virus
  • Route: given subcutaneously (SQ)
  • Age of administration: 6 weeks or older
  • Dosage: 2 vaccinations, given 2-4 weeks apart
  • Frequency: annual vaccination after the two initial doses

More info: Canine Influenza Vaccine overview from Intervet Inc., a subsidiary of Merck & Co.

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