I dogsat for the oodles of poodles I watch every now and then and while I was watching them my dogs got sick with kennel cough. I couldnt figure out how they got it cause mine dont go anywhere but to my van. I called the owners of the oodles ofpoodles to tell them I had seperated them and they may want to come and pick them up and that I was sorry if thiers got sick. they said oh just let them run with mine cause they had it 2 weeks ago. BOY was I pissed. They had brought thier dogs over while they were still contagious and gave it to mine! I was mostly mad cause they didnt tell me. I think they knew I would have never watched thier dogs if I had known and they needed a babysitter. Every one of my dogs got it but the vet said mine were good and healthy so he didnt want to put them on antibiotics unless they really needed it, We just let them ride it through. They are all better now but are still contageous so we are in quarantine so to speak.
Here is a link to an article you can read:
http://www.2ndchance.info/kennelcough.htm