Kennel Cough in Dogs: Signs, Treatment, and Vaccine Requirements

If you're boarding your dog in Cypress, TX this year, you've probably been asked for proof of a Bordetella vaccine. Most owners know it's "for kennel cough," but that's where the understanding usually stops. What is kennel cough, exactly? How serious is it? And why do facilities refuse dogs without that vaccine? At Hearthstone Animal Clinic, I answer these questions weekly, so let me walk you through what you actually need to know.

What is kennel cough?

Kennel cough (the medical term is infectious tracheobronchitis) is a highly contagious respiratory infection in dogs. It's not one single germ. The condition is usually caused by a combination of bacteria and viruses working together, with Bordetella bronchiseptica being the most common bacterial culprit. Canine parainfluenza virus, canine adenovirus type 2, and sometimes canine respiratory coronavirus also play a role.

Think of it like the common cold in humans: multiple pathogens can cause similar symptoms, they spread easily in close quarters, and healthy individuals usually recover without major intervention. But just like a cold can turn into bronchitis or pneumonia in the wrong circumstances, kennel cough can become serious in puppies, senior dogs, or immunocompromised animals.

Why the name "kennel cough"?

The name comes from where dogs typically catch it: kennels, boarding facilities, dog parks, grooming salons, shelters, and anywhere dogs congregate and share air. The bacteria and viruses spread through respiratory droplets (coughing, sneezing) and through contaminated surfaces like water bowls. In a boarding environment, one infected dog can expose dozens of others within days.

What are the signs of kennel cough?

The signature symptom is a dry, hacking cough that sounds like your dog has something stuck in their throat. Many owners describe it as a "honking" sound, almost goose-like. You might notice:

• Forceful, dry cough that often ends with a gag or retch
• Coughing fits triggered by excitement, exercise, or pressure on the collar
• Clear nasal discharge
• Mild lethargy
• Normal or slightly decreased appetite

In uncomplicated cases, that's about it. The dog feels okay overall, just coughs a lot. Symptoms typically appear 3 to 10 days after exposure.

When kennel cough gets serious

Watch for these warning signs that suggest the infection has progressed beyond a simple upper respiratory issue:

• Fever (normal dog temperature is 101 to 102.5 degrees Fahrenheit)
• Thick, colored nasal discharge (yellow or green)
• Decreased appetite for more than a day
• Lethargy beyond just "a little tired"
• Labored or rapid breathing
• Coughing that worsens instead of improving after a week

These can indicate secondary bacterial pneumonia, which requires aggressive treatment. Puppies under 6 months and dogs over 10 are at highest risk for complications.

How is kennel cough treated?

Most healthy adult dogs recover from kennel cough on their own within 1 to 3 weeks. My job is to determine whether your dog needs medical support or just time.

Mild cases

If your dog is eating, drinking, and acting mostly normal between coughing fits, I may recommend:

• Rest and isolation from other dogs for at least 2 weeks (they remain contagious even after symptoms improve)
• Using a harness instead of a collar to avoid tracheal pressure
• Humidity (a humidifier or letting them sit in a steamy bathroom) to soothe irritated airways
• Monitoring for worsening symptoms

I don't automatically prescribe antibiotics for every kennel cough case. Antibiotics don't kill viruses, and if the bacterial load is low, the immune system handles it. Overprescribing creates resistant bacteria, which helps no one.

Moderate to severe cases

When there's fever, significant lethargy, or signs of lower respiratory involvement, I prescribe:

• Antibiotics (usually doxycycline or a fluoroquinolone) to target Bordetella and prevent secondary infection
• Cough suppressants in some cases, though this is a judgment call. Suppressing a productive cough that's clearing mucus from the lungs can backfire.
• Anti-inflammatories if airway inflammation is severe

Hospitalization with IV fluids and oxygen support is rarely needed, but I've seen it with young puppies or dogs with pre-existing respiratory conditions like collapsing trachea (common in small breeds).

Why do boarding facilities require the Bordetella vaccine?

This is the part most owners get wrong, and it's not their fault. The Bordetella vaccine isn't a guarantee your dog won't get kennel cough. It's more like the flu shot for humans: it reduces severity and shortens illness duration, but doesn't provide complete immunity.

Here's why facilities require it anyway:

• Reduced transmission: Vaccinated dogs shed fewer bacteria and recover faster, limiting spread to other boarders
• Milder illness: If your vaccinated dog does catch it, they're less likely to develop pneumonia
• Liability and herd protection: When most dogs in a facility are vaccinated, outbreaks are smaller and less severe

The American Animal Hospital Association (AAHA) classifies Bordetella as a "lifestyle" vaccine, meaning it's not required for every dog, but strongly recommended for dogs who board, attend daycare, visit groomers, or frequent dog parks. For most Cypress dog owners I see, that covers their pets.

How often does my dog need the Bordetella vaccine?

Most boarding facilities in Cypress require the vaccine within the past 6 to 12 months. I typically recommend annual boosters, though dogs at very high exposure (weekly daycare, frequent boarding) may benefit from every 6 months. The vaccine comes in injectable, intranasal, and oral forms. The intranasal and oral versions provide faster local immunity, making them a good choice if you're vaccinating close to a boarding stay.

One thing to know: the intranasal vaccine can cause mild coughing or sneezing for a few days afterward. That's not kennel cough; it's a local immune response. But avoid vaccinating the day before boarding, or the facility may turn your dog away thinking they're sick.

Can my dog still get kennel cough after vaccination?

Yes. This is the most common question I get, and I understand the frustration. The Bordetella vaccine primarily targets Bordetella bronchiseptica, but kennel cough can involve multiple pathogens. A fully vaccinated dog can catch a strain that's virus-dominant, or encounter an unusual bacterial variant.

That said, vaccinated dogs almost always have milder, shorter illnesses. In my experience over 25 years, the dogs I see with complicated kennel cough (pneumonia, prolonged illness, hospitalization) are typically unvaccinated or under-vaccinated.

How can I reduce my dog's risk?

If your dog boards regularly or visits Cypress dog parks, complete protection isn't realistic. But you can lower the odds:

• Keep the Bordetella vaccine current. Annual or every 6 months for high-exposure dogs.
• Ensure core vaccines are up to date. Distemper and parainfluenza protection (included in the DHPP combo vaccine) adds another layer of respiratory defense.
• Choose facilities wisely. Ask about ventilation, cleaning protocols, and whether they require vaccination from all dogs.
• Avoid sick dogs. If a dog at the park is coughing, leave.
• Support overall health. Good nutrition, regular wellness care, and prompt treatment of other conditions keeps the immune system strong.

When to contact your veterinarian

If your dog develops that classic honking cough after boarding, grooming, or a dog park visit, give it a few days if they're otherwise acting normal. But get your pet seen the same day if you notice:

• Fever or loss of appetite
• Coughing that gets worse instead of better after a week
• Labored breathing or rapid respiratory rate
• Thick, discolored nasal discharge
• Any concerning symptoms in a puppy under 6 months, a senior dog, or a dog with existing health conditions

Most kennel cough cases resolve with supportive care at home. But the ones that need intervention need it promptly, and the window between "just a cough" and pneumonia can close faster than owners expect, especially in flat-faced breeds or very young dogs.

If your dog is due for a Bordetella vaccine before boarding, or if they've come home from a Cypress boarding facility with a cough that's not improving, schedule a visit at Hearthstone Animal Clinic. We're located in Cypress, TX and you can reach us at (281) 859-9244. I'd rather see your dog early and confirm it's nothing serious than wait until we're treating pneumonia.