Aspen shavings are okay but sometimes they can be a little dusty. I had used them as bedding for my rats and it would sometimes cause a little sneezing. If you bought aspen already what I would do is measure out how much would be in the cage (once it was spread out from its compressed form) then you can put in a bag and shake it for a few seconds and let all the dust fly out. Once you are finished with that bag of bedding you can continue to use aspen or you can try carefresh ultra or natural. These beddings help a little with odor but they are a little more expensive. Either way any of these two are a good choice for small animals such as mice.
Last edited by PaulO; 09-29-2012 at 08:23 PM.