Horse Dung is a byproduct item in RUST used in farming and was introduced via the Farming 2.0 Update. Players may only acquire it by feeding rideable horses and… ‘collecting’ it after a few moments. It is only helpful as a Fertilizer, created by placing horse dung into the Composter.
Fertilizer serves two potential purposes. It improves the ground quality of the Large and Small Planter Boxes. Alternatively, it can be harvested and sold directly to Bandit Camp at 3 Scrap per 2 Fertilizers.
For more information regarding horse dung, fertilizer, and its assorted uses in plants, check out our extensive Farming Guide.