Intervet Safeguard Dewormer Paste For Horses 92GmSafe-Guard (fenbendazole) Paste 10-percent is indicated for the control of large strongyles (Strongylus edentatus S. equinus S. vulgaris) encysted early third stage (hypobiotic) late third stage and fourth stage cyathostome larvae small strongyles pinworms (Oxyuris equi) ascarids (Parascaris equorum)..