I had a rat a few months ago who had a respiratory infection, I knew because she was sneezing excessively. My vet questioned me a bit and then listened to her lungs with a stethoscope (she said her lungs sounded okay but that we would treat her just to be on the safe side) and prescribed her doxycycline and enrofloxacin for ten days. After finishing the medicine her sneezing stopped. About 5 days later she started making a clicking noise when she was breathing. I started her back on the medicine but it didn't help. Things took a turn for the worst and within three days she had to be euthanized due to extreme respiratory distress. Now I have a rat who is making an extremely faint noise, similar to the one in the beginning of this video. I can only hear the noise if I hold her right next to my ear. The tiny squeaks seem to come and go, usually (like 95% of the time) they are not present. She's actually been making this noise on and off for a while now, (maybe a few months?) but I never thought it was abnormal until seeing this video. I did bring her to get checked out by our vet not too long ago and I mentioned it to him but he listened to her lungs with a stethoscope and said they sounded fine. The doctor I saw that time is not a very good one, there's two rat doctors at the clinic I go to, one of them is awesome, the other sucks, and sometimes when I make appointments I forget to specify. Anyways, as silly as it sounds, I am afraid of taking her into the vet because I don't want to cure her respiratory infection only for it to come back much worse a few days later (like what happened with my other baby). It was super hard losing my other rattie this way and very unexpected as she took a turn for the worst rather quickly. 1. Are there any tests I can ask the vet to do to make sure she has a respiratory infection before treating her? Is there anything I should ask for or request? Is listening to her lungs with a stethoscope enough? 2. How long does she need to on medicine for, is 10 days enough to cure a mild infection? 3. I'm trying to learn more about respiratory infections in general but I am confused about if there is a difference between a respiratory infection caused by Mycoplasmosis and pneumonia? 4. Are respiratory infections contagious to other rats? 5. Could she even have a respiratory infection if its been multiple months? Why hasn't the infection worsened with time? 6. Can respiratory infections be exacerbated by giving medicine? (Like what happened with my other baby?) 7. Is it even worth treating her? To my understanding the illness will likely to come back anyways, so should I wait until she seems like shes not doing well? She seems fine otherwise and like I mentioned she's been doing this on/off for months now. I do plan to bring her to the vet on Friday but I am very anxious as I don't want to exacerbate her condition by giving her medication. She is abnormally stressed right now as we just lost her only cagemate last night, I'm not sure if that's related. I haven't heard her make the noise for a few weeks now, but she has been tonight.