Rats and mice are very sensitive to dust of any kind. If you aren't seeing any kind of runny eyes or noses, then that's probably it. Aspen can be pretty dusty sometimes. The best fix is to *very* lightly mist the aspen after you clean to settle the dust. This might mean you'll have to clean the bedding a little sooner if it gets too wet.
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1.0 normal ball python
0.1 greyband hybrid kingsnake
0.2 crazy cats
1.0 husband

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