A Bordetella shot is a vaccine for dogs that protects against Bordetella bronchiseptica, the bacterium most responsible for kennel cough. It’s one of the most commonly required vaccines for dogs that visit boarding facilities, groomers, dog parks, or daycare. If you’ve been told your dog needs one before an upcoming stay or appointment, here’s what the vaccine actually does, how it works, and what to expect.
What Bordetella Actually Causes
Bordetella bronchiseptica is a bacterium that infects a dog’s upper respiratory tract, causing a condition formally called canine infectious respiratory disease (CIRD) but widely known as kennel cough. The hallmark symptom is a harsh, dry, hacking cough that can sound like your dog has something stuck in their throat. Nasal discharge, sneezing, and in more severe cases, difficulty breathing can also occur. Symptoms typically appear suddenly and last less than 14 days in most dogs.
Kennel cough can be caused by several different viruses and bacteria working alone or together, but Bordetella bronchiseptica is the dominant player. In one study of dogs diagnosed with kennel cough, the bacterium was detected in nearly 79% of cases. Unlike some of the viruses involved, Bordetella can cause full-blown respiratory disease entirely on its own, without any other pathogen present. That’s why it gets its own vaccine.
Three Ways the Vaccine Is Given
The Bordetella vaccine comes in three forms, and the one your dog receives depends on the veterinary clinic and your dog’s temperament.
- Intranasal: A liquid squirted into the dog’s nostrils. This is one of the most common forms because it stimulates immune defenses right where the infection enters the body. It requires only a single dose.
- Oral: A liquid given by mouth. Like the intranasal version, it needs just one dose and triggers a similar local immune response. It’s a good alternative for dogs that resist having drops put in their nose.
- Injectable: Given as a shot under the skin. This version requires two initial doses spaced a few weeks apart to build immunity, making it slower to provide full protection.
Both the intranasal and oral vaccines have been shown to provide protection within seven days of a single dose. The injectable version takes longer because it needs that second dose to fully activate the immune system. For this reason, many vets prefer the intranasal or oral route when a dog needs protection quickly, such as before a boarding stay.
When and How Often Dogs Need It
Puppies can receive the Bordetella vaccine starting at 8 weeks of age. The American Animal Hospital Association classifies Bordetella as a “noncore” vaccine, meaning it’s not required for every single dog the way rabies or distemper vaccines are. Instead, it’s recommended based on lifestyle. If your dog regularly interacts with other dogs in any group setting, it’s considered essential.
After the initial vaccination, dogs typically need a booster once a year, though some facilities and veterinarians recommend boosters every six months for dogs with high exposure. Your vet can help determine the right schedule based on how often your dog is around unfamiliar dogs.
Why Boarding Facilities Require It
Kennel cough spreads rapidly in enclosed spaces where dogs share air, and a single infected dog can trigger an outbreak that affects dozens of others. That’s why virtually every boarding kennel, groomer, doggy daycare, and training facility requires proof of a current Bordetella vaccination before accepting your dog.
Most facilities require the vaccine to have been given at least 14 days before the visit. This buffer ensures full immunity has developed regardless of which vaccine type was used. Some places accept dogs vaccinated as recently as 48 to 72 hours beforehand if the intranasal or oral form was given, but a two-week window is the most common standard. If you’re booking a boarding stay, plan accordingly so your dog isn’t turned away at drop-off.
What the Vaccine Doesn’t Cover
The Bordetella vaccine protects specifically against the Bordetella bronchiseptica bacterium. Kennel cough, however, is a complex involving multiple pathogens. Canine parainfluenza virus, canine respiratory coronavirus, canine herpesvirus, Mycoplasma bacteria, and Streptococcus species can all cause or contribute to respiratory illness in dogs. A vaccinated dog can still develop a cough from one of these other organisms.
Think of it like the flu shot in humans: it significantly reduces risk and severity but doesn’t guarantee your dog will never get a respiratory infection. Because Bordetella is by far the most common culprit, the vaccine still offers substantial protection. Some intranasal formulations also include parainfluenza virus, which broadens coverage slightly.
Side Effects
Modern Bordetella vaccines are well tolerated. Earlier injectable versions used whole bacterial cells and caused reactions in roughly half of dogs, including swelling at the injection site, mild fever, and lethargy. Those formulations prompted the development of newer, refined vaccines that contain fewer bacterial components and cause far fewer problems.
With the intranasal vaccine, the most common reaction is mild sneezing or a slight nasal discharge for a day or two after administration, which makes sense given that the vaccine is delivered directly into the nose. Some dogs may have a brief episode of low energy. The oral version tends to cause the fewest noticeable reactions of the three. Serious adverse events are rare with any current formulation.
Dogs Who Should Wait or Skip It
The vaccine is intended for healthy dogs only. Dogs currently taking antibiotics should not receive it, and antibiotics should be avoided for 14 days after vaccination since they can interfere with the live bacterial component in intranasal and oral versions. Dogs on immunosuppressive medications or treatments should not be vaccinated, and those drugs should be discontinued at least one month before vaccination.
The vaccine is also not recommended for pregnant or nursing dogs due to a lack of safety data and the possibility that the live vaccine strain could spread to puppies. If your dog has a respiratory infection or any active illness, vaccination should be postponed until they’ve recovered.