
KC vaccine isn't considered one of the 'core' vaccines, mainly because it generally isn't - in a usually fit, healthy dog - very serious. It should be considered the equivalent of flu in humans; it makes you feel very poorly but it isn't likely to kill you. It is, however, very infectious, and animals that are in close proximity with each other for an extended period are more likely to pass it on. This is why it's often a condition of the council's licence to boarding kennels that all dogs are immunised against it. There are many strains of illness that cause the same symptoms, and the vaccine doesn't cover all of them, so it doesn't
guarantee that your dog won't pick it up; but if she does the symptoms will be far less severe. Basically if you want to use boarding kennels she'll need to be vaccinated against kennel cough.
The vaccine isn't injected - it's squirted up a nostril like a nasal spray - no needle involved!