Well, I've had my mouse for a little over a year and she has been healthy this whole time. However, the past couple of weeks she has started sneezing all the time and wheezing a bit. I haven't changed a single thing in her cage, and I use carefresh bedding. I did open the windows a month ago because the weather is warm again, so I'm wondering if maybe she is suffering from allergies to outdoor related allergins blowing through the window? Does anyone else have this problem or have any ideas. I'm from a small town and our vet doesn't treat mice, so he's no help. Thanks for your time!!