sawdust,there are problems of cat litter wood pellets also being sold as horse pellets which don't break down as easy.Wood Shavings unless you are buying top end shavings which would cost much more than Fitch Horse bedding then you will have the same problems as with all of the above.So why not solve all those problems and buy online at www.fitchrecycling.co.uk  or talk to one of our friendly staff on 05603 433 012.