This might cause respiratory and allergy challenges in horses If they're exposed to a great deal of dust frequently. Our suggestion will be to use sawdust from Deciduous trees, including Oak, Beech, Maple and Elm. The sawdust from these trees breaks down and decomposes rather speedily, absolutely the best option. https://garrettgexph.pages10.com/not-known-factual-statements-about-douglas-fir-sawdust-for-sale-63838985