Hi, we have a 2 year old cat (short haired and dark gray/blue, maybe Russian blue mix?) who we found as a stray at 4-6 months who has always been a noisy breather. Seems to be when she breathes in. It's a sort of just airy, rarely snorty sound that's similar to a cat snoring. Never once seen any nasal discharge or any other signs of infection. It's not constant, and seems to happen based on her position and emotional state. Sometimes she'll be sitting breathing perfectly quietly, I'll pet her, and it'll start. Sometimes she's fast asleep snoring in a snorty way pretty loudly, I'll scratch her chin or something and she'll move her head, then quiet. We've taken her to the vet for this several times and they always say heart and lungs sound fine, breathing rate is normal. We had her sedated and given a thorough nose/throat exam at the local animal hospital and they said everything looked normal except a bit of inflammation in the back of her throat. They did a test for infection and didn't find anything, but said it could be a latent/chronic calicivirus sort of thing from when she was a kitten. Gave us antibiotics that we mostly failed at getting her to take - refused to eat her food when we mixed it in, then aspirated it when we tried squirting it in her mouth and gave us a terrible scare that we don't want to repeat. Anyway...it seems relatively stable and unchanged over the years. Sometimes seems more noticeable, sometimes barely there. But I still worry there's something we haven't looked into. Is there anything else we can do? Any thoughts or experiences? Thanks!