Kennel cough is generally not a veterinary emergency. Most cases are mild, and dogs fully recover within 7 to 10 days without intensive treatment. But there are specific warning signs that can turn a routine cough into an urgent situation, especially in puppies, senior dogs, or dogs with weakened immune systems.
What Kennel Cough Looks Like When It’s Mild
The hallmark of kennel cough is a dry, honking cough that sounds almost like your dog has something stuck in their throat. Between coughing fits, the dog typically acts normal: eating well, drinking water, playing, and staying alert. This is the version most dogs get, and it often clears up on its own with rest.
Kennel cough is caused by a mix of bacteria and viruses that attack the lining of the windpipe and upper airways. The most common culprit is a bacterium called Bordetella bronchiseptica, though several viruses can be involved at the same time. When multiple organisms are present, symptoms tend to be worse. The incubation period ranges from 2 to 14 days, so your dog may have picked it up well before the cough appeared.
Signs That Do Require Urgent Veterinary Care
A mild cough can progress to something more serious when bacteria move deeper into the lungs and cause pneumonia. According to the American Veterinary Medical Association, you should seek immediate veterinary attention if your dog develops any of the following:
- Labored or rapid breathing. If your dog is visibly working harder to breathe, with flared nostrils, an extended neck, or exaggerated chest movements, that’s a red flag.
- A wet, productive cough. A dry honking cough is typical. A moist cough that sounds like it’s bringing something up suggests lung involvement.
- Fever. A dog’s normal temperature is roughly 101 to 102.5°F. Anything above that range paired with a cough is concerning.
- Lethargy or loss of appetite. A dog that stops eating, won’t get up, or seems unusually dull and unresponsive needs professional evaluation.
- Colored nasal discharge. Clear discharge is common with a mild case. Green or yellow discharge signals a bacterial infection that likely needs antibiotics.
Any one of these symptoms is enough reason to call your vet. If your dog is struggling to breathe, don’t wait for an appointment opening. Head to an emergency clinic.
Dogs at Higher Risk for Complications
Puppies and senior dogs are the most vulnerable to kennel cough turning dangerous. Their immune systems are either still developing or declining, which means they’re less equipped to contain the infection before it reaches the lungs. If a puppy or older dog develops any coughing at all, it’s worth contacting your vet rather than waiting to see how things play out.
Dogs with pre-existing respiratory conditions or compromised immune systems also face higher risk. Flat-faced breeds like bulldogs, pugs, and Boston terriers already have narrower airways, so the swelling caused by respiratory infections can create breathing problems more quickly. Dogs undergoing chemotherapy or taking immunosuppressive medications are similarly vulnerable.
Home Care for Mild Cases
If your dog is coughing but otherwise behaving normally, eating, drinking, and staying active, you can often manage the illness at home. Keep a close eye on food and water intake throughout recovery. Repetitive coughing dries out the airways, so running a hot shower and letting your dog sit in the steamy bathroom for 10 to 15 minutes can help soothe irritated tissues.
Use a harness instead of a collar during walks. Pressure on an inflamed windpipe from a leash pulling against a collar will trigger more coughing fits and slow recovery. Keep your dog away from other dogs during this time, as kennel cough spreads easily through airborne droplets and shared surfaces.
If the cough hasn’t improved after about a week, or if it’s getting worse rather than better, schedule a vet visit even if your dog still seems relatively well. A cough that lingers or intensifies may mean a secondary infection is developing.
What Happens at the Vet
Your vet will typically start with a physical exam, listening to the lungs and checking for fever. In straightforward cases, that’s often enough to make a diagnosis and start treatment. If pneumonia is suspected, chest X-rays help confirm whether the infection has spread to the lungs. These generally cost $75 to $400 depending on your location and the clinic.
For cases where the specific pathogen matters, perhaps during an outbreak or when standard treatment isn’t working, a respiratory PCR panel can identify the exact bacteria or viruses involved. Results take 2 to 4 days, though rush processing is sometimes available. A basic sick visit exam typically runs $75 to $300 before any diagnostics or medications.
Treatment depends on severity. Mild cases may get a cough suppressant to help the dog rest more comfortably. Dogs showing signs of bacterial infection, like colored nasal discharge, lethargy, or decreased appetite, usually receive a course of antibiotics. Dogs with pneumonia may need more aggressive treatment including IV fluids and hospitalization, which raises costs significantly.
Vaccination Offers Partial Protection
The Bordetella vaccine reduces the severity of kennel cough but doesn’t guarantee your dog won’t catch it. Because kennel cough involves multiple pathogens, no single vaccine covers every possible cause. The protection the vaccine provides may last as little as six months, which is why the American Animal Hospital Association recommends that high-risk dogs, those who board frequently, attend daycare, or visit dog parks, may benefit from vaccination more often than once a year. Many boarding facilities require an updated Bordetella vaccine before accepting a dog.
Even vaccinated dogs can still develop kennel cough, but they’re less likely to get a severe case. Think of it like a flu shot: it doesn’t make you immune, but it stacks the odds in your favor.