Canine Influenza (Dog Flu): When the Vaccine Matters for Traveling Dogs

When traveling with your dog, there’s plenty to think about—food, medications, travel plans, and where they’ll stay.

But there’s one thing many owners don’t realize they may need depending on their plans: protection against canine influenza.

At PetMed of Key West Veterinary Clinic in Dubuque, we don’t recommend every vaccine for every dog—and canine influenza is a great example of that. It’s not common in our area, but in the right situations, it can absolutely matter.

What Is Canine Influenza?

Canine influenza (dog flu) is a contagious respiratory virus that spreads between dogs.

It is different from kennel cough, although the symptoms can look very similar.

Dogs with influenza may develop:

Coughing
Runny nose
Lethargy
Fever

Most cases are mild, but some dogs—especially older dogs or those with underlying conditions—can develop pneumonia or more serious complications.

Why the Flu Vaccine Isn’t One-Size-Fits-All

Canine influenza is similar to human flu in one important way:
there are multiple strains, and they can change over time.

The two most common strains in dogs are:

H3N8
H3N2

Most vaccines are designed to cover the strains currently circulating, but no single vaccine protects against every possible strain.

This is part of why we don’t recommend the influenza vaccine for every dog.

Instead, we use it strategically:

When exposure risk is higher
When dogs are traveling to areas with known outbreaks
When they will be in close contact with large numbers of other dogs

How Canine Influenza Spreads

Canine influenza spreads easily between dogs through:

Respiratory droplets (coughing, sneezing, barking)
Direct contact with infected dogs
Contaminated surfaces such as bowls, toys, leashes, and kennel areas

This is why outbreaks tend to occur in places where dogs are in close contact, such as:

Boarding facilities
Daycare environments
Shelters
Dog shows and large gatherings

How Long Is It Contagious?

Dogs infected with canine influenza can begin shedding the virus before showing obvious symptoms.

They may remain contagious for several days to over a week, depending on the strain and severity of infection.

This makes it easy for the virus to spread quickly in group settings.

How Long Does It Live on Surfaces?

The virus does not survive indefinitely in the environment like parvo, but it can remain viable long enough to spread.

On surfaces: up to about 24–48 hours
On hands: up to about 12 hours
On clothing: up to about 24 hours

That means transmission doesn’t require direct dog-to-dog contact—indirect exposure is possible.

Is Canine Influenza Common in Dubuque?

Thankfully, no.

We do not routinely see canine influenza in our area, and it is not considered endemic in Dubuque or surrounding communities.

For most dogs living a local lifestyle—going for walks, playing in the yard, and not traveling or boarding—this vaccine is not necessary.

When the Vaccine Does Matter

Where this changes is with travel and exposure.

We recommend considering the canine influenza vaccine for dogs who:

Travel to larger cities or regions with known outbreaks (such as Chicago or other metropolitan areas)
Stay in boarding facilities, especially those with high turnover
Attend dog shows, competitions, or large gatherings
Spend time in daycare or group housing environments
Travel through airports or stay in pet hotels

These environments significantly increase exposure risk.

The Vaccine Schedule

If your dog needs the influenza vaccine:

Initial series: Two doses given 2–4 weeks apart
Booster: Once yearly if ongoing risk continues

We recommend starting the series at least 3–4 weeks before travel or boarding to allow time for protection to develop.

A Balanced Approach to Vaccination

At PetMed of Key West Veterinary Clinic, we don’t take a one-size-fits-all approach to vaccines.

Some vaccines—like distemper, parvo, rabies, and leptospirosis—are essential in our area.

Others, like canine influenza, depend on lifestyle and exposure.

Our goal is simple:

Recommend what your dog actually needs
Avoid what they don’t
Make decisions based on real-world risk

The Bottom Line

Canine influenza is not a major concern for most dogs in Dubuque.

But for dogs who travel, board, or spend time in high-density environments, it can become very relevant.

Planning ahead matters.

If your dog is heading into a higher-risk situation, this is one of those vaccines that can help prevent a stressful—and sometimes serious—respiratory illness.

Canine Influenza FAQs

Is canine influenza the same as kennel cough?

No. They are different diseases, although they can cause similar symptoms.

Does the flu vaccine protect against all strains?

No. The vaccine covers the most common circulating strains but does not protect against every possible strain.

Is the canine influenza vaccine required?

Not routinely. It is typically recommended based on travel, boarding, or exposure risk.

How long before travel should my dog be vaccinated?

Ideally at least 3–4 weeks before travel to allow time for the initial vaccine series.

Can my dog get canine influenza without direct contact with another dog?

Yes. The virus can spread through contaminated surfaces and indirect contact.

Is canine influenza common in Dubuque?

No. It is currently uncommon in our area, which is why the vaccine is not routinely recommended for all dogs.

Local Care You Can Trust

PetMed of Key West Veterinary Clinic proudly serves Dubuque, Asbury, Peosta, Epworth, Dyersville, Farley, and surrounding communities.

If you’re planning travel or boarding and want to make sure your dog is properly protected, we’re happy to help you build a plan that fits your dog’s needs.

Written by Dr Mackenzie Hellert

Updated 3/30/26