This document discusses strongyle control in horses. Strongyles are intestinal parasites that infect horses. Traditionally, all horses were treated periodically with anthelmintic drugs to kill strongyle larvae and adults. However, this approach has led to increased anthelmintic resistance in small strongyles. Now, a targeted approach is recommended where only horses with moderate to high fecal egg counts based on diagnostic testing are treated. This targeted approach helps minimize drug use and slow the development of further anthelmintic resistance.