Horse Deworming: Schedule, Products, and When to Deworm
Regular deworming is fundamental for the health of any horse. However, the protocol has changed in recent years: it is no longer recommended to routinely deworm all horses on the same dates.
The new approach: strategic deworming
The equine WHO and leading veterinarians currently recommend:
- Performing fecal egg counts (eggs per gram) before deworming.
- Treating only animals that exceed the infestation threshold.
- Rotating active ingredients to prevent resistance.
Indicative deworming schedule
| Season | Target parasite | Active ingredient |
|---|---|---|
| Spring (March-April) | Strongyles, ascarids | Ivermectin or fenbendazole |
| Summer (July) | Bots (larvae), strongyles | Ivermectin |
| Autumn (Oct.-Nov.) | Bots, strongyles | Ivermectin + praziquantel |
| Winter (Jan.-Feb.) | Small strongyles | Moxidectin or fenbendazole |
Antiparasitic resistance
The overuse of ivermectin has generated resistance in many farms. To combat this, rotate between ivermectin, moxidectin, and fenbendazole, and consult your veterinarian about the most suitable program for your area.
Never deworm without consulting your veterinarian. The incorrect dose can be ineffective or toxic.
