Canine Flu FAQ
experts at the ASPCA Animal Poison Control Center answer the most commonly
asked questions about canine influenza virus.
What is the Canine Flu?
Canine influenza is a contagious viral infection of dogs, caused
by Influenza Virus A subtype H3N8.
Did this virus come from the Bird Flu?
No-the canine influenza virus is not a mutation of avian
influenza, commonly known as Bird Flu. The avian flu virus of worldwide concern
is a different subtype (H5N1). While both are in the same broad, general family
of viruses (Orthomyxoviridae) that cause the flu in people, pigs and birds,
they are not the same strain. Canine influenza is actually more closely related
to the horse or equine influenza virus, and likely mutated from this
What does the Canine Flu do to dogs?
The canine influenza virus can cause mild to severe illness.
Mild effects include a soft, moist cough with or without a low grade fever that
lasts 10 to 30 days despite treatment, along with yellow/green nasal discharge
if a secondary bacterial infection occurs. More severe illness can result in
high grade fever as well as rapid/difficult breathing, which is usually caused
by secondary pneumonia.
Is Canine Flu fatal?
Typically, most infected dogs develop mild to moderate signs
that resolve within 10 to 30 days without problems. As with other flu viruses,
fatalities can potentially occur, but are not common and are generally due to
secondary complications such as bacterial pneumonia.
Is the virus just in a few states, or is it all over?
Canine Flu is currently considered to be
an endemic virus, meaning that outbreaks have occurred
sporadically in certain areas. Currently, outbreaks at dog race tracks
have been reported in Alabama, Arizona, Arkansas, Colorado, Florida, Iowa,
Kansas, Massachusetts, Rhode Island, Texas, West Virginia and Wisconsin.
Outbreaks in pet dogs have occurred in California, Connecticut, Florida,
Georgia, Massachusetts, North Carolina, New Jersey, New York, Ohio, Oregon,
Pennsylvania, the state of Washington, and Washington, D.C. These cases
occurred in animal shelters, rescue groups, pet stores, boarding kennels and
How easy is it for my dog to catch?
The virus is contagious-spread via aerosolized respiratory
secretions. Thus far, most outbreaks have occurred between dogs who are kept in
large numbers in relatively close quarters, such as greyhounds at racing
tracks. The risk of infection in a canine who does not attend dog shows or
frequent kennels is fairly low. However, because this is a recently emerged
disease, there is no natural or vaccine-induced immunity-so all dogs are
I think my dog may have caught Canine Flu. How do I know for sure?
The symptoms of canine influenza closely resemble those seen
with other respiratory diseases, such as kennel cough. Because of this, kennel
cough can potentially be mistaken for canine flu.
While there is currently no reliable rapid test available to
veterinarians for diagnosing canine influenza, tests are available at certain
diagnostic labs. For more information, contact your local veterinarian.