Two of my three girls are sneezing A LOT. It was mild a month ago, and Baytril from the vet didn’t seem to do anything. Now sneezing is much worse and I am taking the girls back to the vet. Which medication should I ask for? I think I’ve read Doxycycline, and perhaps another antibiotic simultaneously. Also, should I medicate the third girl pre-emptively? Thanks in advance for any advice!