Most cats with kennel cough recover within seven to ten days with supportive care at home. The condition is usually mild and self-limiting, meaning your cat’s immune system does the heavy lifting while you focus on keeping them comfortable, hydrated, and breathing easily. Severe cases can take up to a month to fully resolve, so knowing what to do (and what to avoid) makes a real difference in how smoothly your cat gets through it.
What Kennel Cough Looks Like in Cats
Kennel cough in cats is most often caused by Bordetella bronchiseptica, the same bacterium behind kennel cough in dogs. Cats can actually catch it directly from dogs. The bacteria latch onto the lining of the respiratory tract using small hook-like structures and produce toxins that damage the tissue, triggering coughing, sneezing, nasal discharge, and sometimes a mild fever. Cats who’ve been in shelters, boarding facilities, or multi-cat households are most at risk because stress and crowding make the infection more likely to take hold.
In most cases the symptoms stay in the upper airways: a persistent cough, sneezing, runny nose, watery eyes, and mild lethargy. Your cat may lose interest in food because congestion dulls their sense of smell. These are the cases you can typically manage at home.
Steam Sessions to Ease Congestion
Humid air is one of the most effective tools you have. It loosens mucus in your cat’s nasal passages and airways, making it easier for them to breathe and clear discharge on their own. VCA Animal Hospitals recommends a simple bathroom steam method: close the bathroom door, shut windows, turn off vent fans, and run a hot shower until the room fills with steam. Then bring your cat in (not into the shower) and let them breathe the moist air for 10 to 15 minutes.
You can do this once a day or more frequently if your cat tolerates it well. Some cats find the experience stressful, so watch their behavior. If they’re panicking or trying to escape, a shorter session or a cool-mist humidifier placed near their resting area is a gentler alternative. The goal is consistent exposure to moist air, not a single dramatic session.
Keeping Your Cat Eating and Drinking
Congestion kills a cat’s appetite because cats rely heavily on smell to decide whether food is worth eating. When their nose is stuffed up, even their favorite meal can seem unappealing. The simplest fix is warming their wet food slightly. Research from Tufts University’s veterinary nutrition team found that cats as a group preferred food warmed to about 99°F over room temperature or refrigerator-cold food. Warming releases more aroma, which helps cut through the congestion. Test the temperature on your wrist before serving to make sure it won’t burn their mouth.
If your cat still won’t eat, try switching to a stronger-smelling wet food, like one with fish. You can also add a small amount of low-sodium chicken broth (make sure it contains no onion or garlic, both toxic to cats) to make the food more liquid and aromatic. Hydration matters just as much as calories here. A dehydrated cat recovers more slowly and is at greater risk for complications. If your cat won’t drink from their bowl, try a pet water fountain, ice cubes to lick, or water mixed into their food.
Rest and a Calm Environment
Your cat’s immune system needs energy to fight off the infection, and stress diverts that energy. Set up a quiet, warm spot away from other pets and household activity. A clean bed in a room with low foot traffic is ideal. If you have other cats or dogs, isolating your sick cat serves double duty: it reduces their stress and prevents the bacteria from spreading.
Gently wipe away any discharge from their nose and eyes with a warm, damp cloth a few times a day. Keeping their face clean helps them breathe and smell their food. Be gentle around the nose, which can become raw and sore from repeated wiping.
Never Give Human Cough Medicine
This is the most important safety warning for home treatment. Human cold and cough medications contain ingredients that are dangerous or fatal to cats. Acetaminophen (the active ingredient in Tylenol) can kill a cat with a single dose. But the danger goes well beyond that one ingredient. Pseudoephedrine and ephedrine, found in many decongestants, cause rapid heart rate, dangerously high blood pressure, tremors, and can be lethal at doses as low as 10 to 12 mg per kilogram of body weight. Dextromethorphan, the cough suppressant in most OTC cough syrups, can cause severe neurological symptoms including loss of coordination, agitation, and seizure-like shaking.
Nasal decongestant sprays containing oxymetazoline or xylometazoline can cause heart rhythm problems and dangerous drops in blood pressure. Even first-generation antihistamines, which some people assume are safe for pets, can trigger sedation, rapid heart rate, tremors, and seizures in cats. The bottom line: no human medication of any kind unless your vet specifically prescribes it with a dose calculated for your cat’s weight.
Cleaning and Preventing Spread
Bordetella bacteria can survive on surfaces, food bowls, bedding, and litter boxes. If you have other pets in the house, disinfecting shared items is essential. The CDC recommends a diluted bleach solution: mix a quarter cup of household bleach into one gallon of water. First wash the item with soapy water to remove visible dirt, rinse it, then soak it in the bleach solution for at least 10 minutes. Rinse again thoroughly and let it dry completely before your pet uses it. For items too large to soak, wipe them down with the bleach solution and leave it on for the full 10 minutes before rinsing.
EPA-registered disinfectant wipes or sprays also work, but you need to follow the contact time listed on the label, not just give the surface a quick swipe. Wash your hands after handling your sick cat before touching other pets. Wash bedding in hot water. Use separate food and water bowls during the illness.
Signs the Infection Is Getting Worse
Most cases stay mild, but Bordetella can move into the lungs and cause pneumonia, especially in kittens, elderly cats, or cats with weakened immune systems. According to Cornell University’s Feline Health Center, you should watch for these warning signs:
- Rapid breathing at rest: more than 35 breaths per minute while your cat is relaxed or sleeping
- Labored breathing: visible effort with each breath, belly heaving, or open-mouth breathing
- Blue-tinged gums or tongue: a sign of dangerously low oxygen called cyanosis
- Complete refusal to eat or drink for more than 24 hours
- Worsening lethargy: your cat is unresponsive or too weak to stand
Any of these symptoms mean the infection has likely spread to the lower respiratory tract. This is no longer a situation for home care. Bacterial pneumonia in cats can deteriorate quickly and requires professional treatment.
Vaccination and Long-Term Prevention
A Bordetella vaccine exists for cats, but it’s classified as non-core by the American Association of Feline Practitioners, meaning it’s not routinely recommended for every pet cat. It’s primarily used as part of a control program in multi-cat households where Bordetella infection has been confirmed, or for cats entering shelters or boarding facilities. The vaccine is given intranasally (drops in the nose) and should never be injected. If your cat lives with dogs who visit kennels or dog parks, or if you foster animals, ask your vet whether vaccination makes sense for your situation.
Beyond vaccination, the biggest risk factors are stress and crowding. Cats who live in stable, low-stress environments with good ventilation rarely develop kennel cough even if they’re exposed to the bacteria. Keeping your cat’s overall health strong, minimizing major disruptions, and quarantining any new animals you bring home for a week or two before introducing them to your resident cats all reduce the risk significantly.