Kennel Cough vs. Canine Flu: What’s the Difference?

If your dog suddenly develops a cough, it’s natural to be concerned — and one of the first questions we often hear is: “Is it kennel cough or the canine flu?” While both conditions affect the respiratory system and spread easily between dogs, they’re caused by different pathogens and require slightly different care.

Below, we’ll break down the key differences between kennel cough and canine flu, what symptoms to watch for, and how to protect your pup.

What Is Kennel Cough?

Kennel cough is a broad term for a contagious upper respiratory infection, often caused by Bordetella bronchiseptica — but it can also involve viruses like parainfluenza or canine adenovirus.

It spreads quickly in places where dogs congregate, such as:

• Boarding kennels
  
• Grooming salons
  
• Dog parks
  
• Daycare facilities
  

Symptoms of Kennel Cough:

• Dry, hacking cough that sometimes sounds like honking
  
• Retching or gagging
  
• Mild fever
  
• Sneezing or nasal discharge (sometimes)
  
• Normal appetite and energy levels in mild cases
  

Most dogs recover in 1–2 weeks, but puppies, seniors, or immunocompromised dogs may develop complications like pneumonia.

What Is Canine Influenza?

Canine flu is caused by influenza viruses (H3N2 or H3N8 strains) and is highly contagious. Outbreaks occur periodically in the U.S., including here in Georgia.

Unlike kennel cough, canine flu can make dogs feel much sicker and spread even before symptoms appear.

Symptoms of Canine Flu:

• Persistent cough (often wet or moist-sounding)
  
• Fever (sometimes high)
  
• Lethargy
  
• Loss of appetite
  
• Nasal discharge (clear or yellow/green)
  
• Eye discharge
  

In more severe cases, canine flu can lead to pneumonia and serious respiratory complications.

Key Differences at a Glance

When to See the Vet

Regardless of which illness your pet has, a persistent cough or changes in behavior warrant a visit. Dogs with fever, lethargy, or breathing difficulties should be seen immediately.

Our team can perform diagnostic tests to determine the cause and recommend the best treatment — which may include cough suppressants, fluids, antibiotics (if secondary infections are present), or antiviral care.

Prevention Tips

Vaccination

• Kennel cough (Bordetella) and canine influenza vaccines are available and recommended for dogs who: 
  • Visit dog parks or daycare
    
  • Stay in boarding facilities
    
  • Attend grooming appointments
    
  • Are exposed to other dogs regularly
    

Hygiene & Isolation

• Wash hands and leashes after contact with other dogs
  
• Avoid contact with sick pets
  
• Don’t take your dog out if they’re coughing or unwell

Is Your Dog Protected?

At Countryside Animal Hospital, we offer both Bordetella and canine influenza vaccines for your dog.  Let’s keep your dog healthy and social — safely. Schedule an Appointment Today or Give Us a Call. We’ll be more than happy to help!