My little silkie has had a cough/sneeze for over a month now. I started with metronidazole and that seemed to help at first. A few weeks later it started up again. I did a stronger dose of metronidazole and it didn't work, so then I tried doxycycline and that didn't work either. she doesn't have watery eyes or a runny nose, but she is wheezy and sneezing/coughing. I have bought and tried VetRx and that isn't helping either. When she breathes there is a loud popping sound, I can hear her in the other room. Someone mentioned a respiratory fungal infection, but is there any other treatments for that besides oxine? I could get it but it would take a while.