Nope, not a bit. I feed both of mine in their enclosures, as well as on shredded aspen, and while they may swallow a bit along with their prey, it won't hurt them. Remember, they can digest bone, hair, teeth, organs, etc. and a little cellulose isn't going to hurt a thing. If you are worried about it, you can always place a sheet of newspaper or paper towel down whenever you feed them. I prefer not to because my girl, only during feeding time, would eat my lunch if anything warm came near her head :)