
Hi TT
>i.e show goers could go and take an infected dog and not realise until a fortnight later perhaps when the dog starts with the cough, by which time the dog has already been in contact with several others and possibly passed it on
it's the virus being spread through coughing, sneezing etc which causes the problem - a dog not yet showing symptoms won't pass on the virus unless perhaps through shared water bowls (which is an absolute no-go with my dogs whether at shows or training), judges handling so many mouths, dogs playing together etc. Basically this is an air borne virus so caught in similiar ways to the common cold in humans and with probably as many variants.
It's correct there is an incubation period of anything from around 7-14 days and a dog may not start to cough until it has arrived at a show but often this excuse is made by people who are just too plain greedy and selfish to consider the health of other dogs at a show and, importantly, means spreading this disease when back home onto elderly dogs with compromised health or pups in the nest - both of which could die from it.
For the OP, I've never given my dogs a KC vac because of the many different strains for which it has no affect. In 20 years mine have had around 4 bouts of KC, all picked up at shows, and thankfully not always affecting every dog at home - usually the more robust ones show no symptoms at all although all are kept segregated from other dogs for 3 weeks post symptoms to avoid cross infection.
regards, Teri