Health & Medical

The first time I heard it, I thought my dog had swallowed a goose. That rattling, dry honk — like a squeaky toy with a cold — is kennel cough, and it tours every vet waiting room in the country. Mine picked it up after a weekend at the boarding kennel.

Kennel cough is not one germ. The headliner is a bacterium called Bordetella bronchiseptica, but the real picture is a mix. Canine parainfluenza virus, adenovirus type 2, and sometimes mycoplasma pile on. One bug irritates the airway, and the others slip in through the damage. That is why the cough lingers longer than a plain cold.

It spreads the way colds spread in a kindergarten. Close quarters do it. Boarding facilities, dog parks, training classes, shelter runs, even a nose-to-nose hello on a crowded sidewalk. The bacteria and viruses ride in tiny droplets when a dog coughs or sneezes, and they sit on shared water bowls and surfaces for a while. If your dog goes anywhere dogs gather, the odds catch up.

The cough has a signature. Dry. Hacking. Honking. Often it ends in a retch or a gulp, like the dog is clearing something that isn't there. It shows up a few days after exposure. Most healthy adult dogs keep their temperature and their appetite. They act like themselves between fits. That calm is what fools you into thinking it's nothing.

Usually it is nothing serious. In a sturdy adult dog the illness is self-limiting. It runs its course in one to three weeks, much like a chesty human cold. Rest, a humid room, and a loose collar help — a pulled leash against a sore trachea makes the coughing worse, so switch to a harness. The vet may prescribe a cough suppressant so everyone sleeps.

But "usually" carries an asterisk. Puppies, old dogs, and flat-faced breeds — bulldogs, pugs, Frenchies — can slide from annoying to dangerous fast. Their airways are already compromised. A cough that tips into pneumonia is the real worry, along with any dog that stops eating, runs a fever, goes lethargic, or breathes hard. Blue-tinged gums mean go now.

We vaccinated our younger dog with the intranasal version before boarding. It's a squirt up the nose that protects within a few days and covers Bordetella directly. There is also an oral form and an injectable one. The shot takes longer to work and some vets pair it with the others for broader coverage. It is no guarantee — the disease wears many faces — but it takes the edge off and shortens spread. Many kennels require it anyway, so ask your vet before a stay.

Diagnosis is mostly by ear and history. The vet listens to the lungs, asks where the dog has been, and rules out the scary look-alikes: a collapsing trachea in an older small dog, or congestive heart failure, which also coughs but wetter, often at night. They might x-ray the chest if something looks off. There is rarely a lab panel unless the dog is sicker than the cough suggests.

Here is the part I wish someone had stressed. If the cough lasts beyond three weeks, or your dog brings up colored phlegm, or the honking turns productive and rainy-sounding, that is past the self-care line. Puppies with kennel cough should see a vet early, not after they fade. Brachycephalic dogs too. The waiting room is exactly where you don't want to linger with a fragile pup, so call ahead and ask to be seen straight from the car.

One summer our boarder coughed for eleven days, ate fine, played fine, then simply stopped. The vet listened, said the trachea was clear, gave a suppressant, and sent us home. Two days later he was himself again. That is the common story. The uncommon one — the one that lands a dog on oxygen — is why I never shrug off a puppy's cough, and why I keep the recovered dog away from others for a few weeks after, because they can still shed.

A note on timing, because I got this wrong once. The intranasal vaccine needs about two weeks to build protection, so giving it the morning you drop your dog at the kennel is too late. Our clinic wants it done at least a week ahead, two to be safe. The oral version is similar. Plan the shot when you book the stay, not when you pack the car.

A friend's eight-week-old pup caught it at a puppy socialization class and was in the ER within four days with pneumonia. He pulled through, but it cost her a week of nebulizer treatments and a scare she didn't deserve. That gap between usually fine and not fine lives entirely in the young and the flat-faced.

This is not a substitute for veterinary care. If you are unsure whether your dog's cough is the harmless kind, a five-minute call to your clinic costs nothing and can spare a week of guessing.