I am pretty sure cedar has ill effects of large animals (aromatics), and even my kids Guinea Pigs - we use a paper-ish cellulose product that's free of allergens, and scents. Check with JC Campbell and see what they say; they're very organically oriented.
http://homeguides.sfgate.com/cedar-m...ens-66364.html - I may have to rescind that cedar comment based upon this article.