Sorry for the dumb question, now I remember. Kaji's friend got it once, and I kept him away from her until the vet gave us the ok. Her mom cleaned everything to make sure it was safe for Kaji to come play. Her vet said that once getting kennel cough they become immune for a while. (I think 6 months?) Poor baby got it soon after her immunity was over. We had to keep them apart again.
I'd be very careful since you have 2 furbabies. I hope your little one doesn't have kennel cough!