26/02/2026
Spring only a few weeks away! 🙌 It’s not too early to start thinking about a deworming plan for your horses.
If deworming is something you’ve been doing the same way for as long as you can remember, this year we encourage you to break tradition and work with your veterinarian instead. Thanks to tools like the f***l egg count, your horse doctor can help you devise a treatment tailored to the needs of your equine friend plus monitor the efficacy of the dewormer used last.
Before you dismiss this notion because you’ve been “doing it for years,” you should know that the old-school approach to deworming is quickly becoming outdated. Not only is it a waste of money, but it also builds drug resistance in the parasitic fauna of equines, which means we are running out of drugs that can effectively help us control parasite infections.
For more information, the AAEP Parasite Control Guidelines can be found on our website: https://aaep.org/resource/internal-parasite-control-guidelines/
Key take-home messages from these Internal Parasite Disease Control Guidelines include:
• Perform f***l egg count reduction tests (FECRT) annually to ensure that you are using effective dewormers in every herd or barn.
• Recognize that no anthelmintic will eliminate all parasitic stages from a horse.
• Continue using f***l egg counts (FEC) once or twice a year to stratify horses into low, medium, and high shedders to reduce pasture contamination.
• Deworm all horses at a baseline rate (once or twice a year) and target selected horses more often based on FEC (strongyle high shedders).
• Do not use FEC to diagnose disease in horses; there is no correlation between FEC and disease-causing parasite life stages.
• Discontinue deworming all horses with fixed intervals year-round (e.g., every 2 months), and stop blindly rotating anthelmintic classes.
As always, consult your equine veterinarian to learn more and for questions specific to your horses!