Dog Flu: Keep Your Pet Safe

From the WebMD Archives

You’ve heard of flu outbreaks making people sick, but they can happen to dogs, too. Our doggie friends can catch "canine influenza," which not only makes them feel bad, but can be dangerous to them. 

It’s not a new condition. Scientists discovered one strain of this flu, called the H3N8 virus, more than 40 years ago. At the time, it only affected horses. But in 2004, a group of greyhounds in Florida got sick with it. It now spreads easily between dogs. There is also a newer strain, called H3N2.

If you know the signs, you can help your dog feel better, or maybe keep him from getting sick at all.

Symptoms

"Just like when people get the flu, you can expect your dog to sneeze, have a runny nose, and cough,” says Barry N. Kellogg, senior veterinary advisor to the Humane Society Veterinary Medical Association. Your dog may also be tired and not have his usual appetite. Some dogs also can have a fever of 104-106 F.

Sometimes, you may not know your dog has the virus. Up to 20% of dogs with the flu don’t show any symptoms.

Risks

Most dogs that get the virus survive it. But canine influenza "can cause more serious illness than the average respiratory infection,” says Cynda Crawford, DVM, PhD, of the University of Florida College of Veterinary Medicine.

In some cases, this type of flu can turn into pneumonia. At that point, the disease becomes more dangerous. Puppies and older dogs are more likely to get severely ill once they’re infected.

All ages and sizes of dogs are equally at risk. But “dogs with ‘smushed-in’ faces like pugs, French bulldogs, and Pekinese may have a tougher time dealing with the flu,” Crawford says. “Because of the anatomy of their respiratory tract, any respiratory illness takes a harder toll on them.”

How It Spreads

Dog flu is very contagious. Your pup can catch it when an infected dog sneezes or coughs on him. Since the virus also can live on objects, he could get it by putting an infected ball or toy into his mouth.

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If your dog is exposed to the virus that causes dog flu, the chances of catching it are “close to 100%,” Crawford says. “The vast majority of dogs in the U.S. have not been previously infected or vaccinated against dog flu.”

It's possible for people to give their dogs the virus, too. If an infected dog coughs or sneezes on you, the virus can survive on your skin for 2 minutes and for a day or longer on your clothes -- and then it could be passed on to another dog.

What about people getting this kind of flu from their dogs? “So far, there have been no reported human cases,” says Amesh Adalja, MD, of the University of Pittsburgh Medical Center and School of Medicine. If you get the flu, you didn’t get the canine kind.

But flu viruses are great at adapting themselves to infect other animals, so there’s always a risk people could get it, Adalja says.

Treatment

Just like people, dogs need rest and fluids, Kellogg says. Make sure your pet has a quiet, comfortable place to recover and plenty of water to drink. Your vet may prescribe antibiotics if your dog gets a bacterial infection along with the flu.

If your pet shows any signs that he’s sick, it’s important to keep him away from other dogs. Avoid dog parks, kennels, or any other place where he’ll be around a lot of other dogs, Adalja says. Most dogs get better in 2-3 weeks.

Is There a Vaccine?

Yes. There is a vaccine for the H3N8 strain, one for the H3N2 strain, and a vaccine that covers both strains in one shot.

 If you live in an area where there has been an outbreak of dog flu, or your pet often comes into close contact with other dogs, it might be a good idea for him to get vaccinated.

“The vaccine doesn’t necessarily prevent the flu,” Kellogg says, but will make it less severe. “Talk to your veterinarian and see if he or she recommends it.”

WebMD Pet Health Feature Reviewed by Amy Flowers, DVM on June 17, 2017

Sources

SOURCES:

Barry N. Kellogg, DVM, senior veterinary advisor, Humane Society Veterinary Medical Association.

Amesh Adalja, MD, senior associate, Center for Health Security, clinical assistant professor of critical care and emergency medicine, University of Pittsburgh Medical Center and School of Medicine.

Cynda Crawford, DVM, PhD, department of small animal clinical sciences, University of Florida College of Veterinary Medicine.

Edward Dubovi, PhD, director, Virology Laboratory, Cornell University College of Veterinary Medicine.

CDC: “Key Facts about Canine Influenza (Dog Flu)."

American Veterinary Medical Association: “Canine Influenza FAQs.”

Cook County, IL: “Surge in Canine Flu Demands Extra Precautions by Pet Owners.”

Flu.gov: “H5N1 Avian Flu (Bird Flu),” “Avian Influenza A (H7N9).”

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