Tools you might need next
Estimate horse body weight from heart girth and body length measurements. Use the standard equine weight formula for dosing, feeding, and transport planning.
Calculate daily horse hay and grain feeding requirements by body weight, workload, and life stage. Forage-first ration planning for equine nutrition.
Calculate English and Western saddle seat size and tree width from rider measurements and horse conformation. Guide for proper saddle fit.
Fecal egg count per gram determines shedding level. High shedders (>500 EPG) need more frequent treatment; low shedders (<200) may need once or twice yearly.
Treat when FEC > 200–500 EPG (strongyles)Use different anthelmintic classes to slow resistance. Ivermectin/moxidectin (macrocyclic), fenbendazole (benzimidazole), pyrantel (pyrimidine).
Rotate: macrocyclic lactone → benzimidazole → pyrimidineSpring moxidectin or fenbendazole 5-day for encysted small strongyles. Fall praziquantel combination for tapeworm. Winter ivermectin for bots.
Spring: encysted strongyle | Fall: tapeworm + botsUpdated: July 2026
FEC of 800 EPG triggers treatment every 8–12 weeks during grazing season with class rotation, retesting 2 weeks post-treatment.
FEC under 150 EPG year-round — spring encysted strongyle treatment and fall tapeworm/bot dose may suffice without summer treatments.
FEC on arrival, treat if positive, retest in 2 weeks. Hold in quarantine paddock 48 hours post-deworming to prevent pasture contamination.
Modern equine parasite control uses targeted deworming based on fecal egg counts rather than calendar rotation alone. Enter your horse's FEC results, age, and climate to generate a seasonal deworming schedule with appropriate anthelmintic classes.