I tried searching the forums for posts about leaves, but most of them pertained to using leaves in the runs. My run will be in the woods, so I don't think I'll have a choice of whether or not I get leaves in my run. On the other hand, I was wondering about using leaves for litter. I'd rake them up from the edges where the yard meets the woods and use that as litter as long as I had leaves to rake. When leaves were not available I would use pine shavings. Would this be okay?