Sample Deworming Protocol for the Adult Horse

For more detailed information about Fecal Egg Counts and deworming, please visit our Parasites & Deworming page.

Performing a fecal egg count (FEC) helps determine if the horse is a low (<200epg), moderate (200-500 epg), or high (>500 epg) shedder. It is important to perform this FEC 3-4 months after the last deworming for accurate results.

For horses with particularly high FEC, it may be recommended that a Fecal Egg Count Reduction Test (FECRT) be performed 14 days after a dewormer is given. This helps ensure that the dewormer used was effective at decreasing your horse’s parasite load and that resistance is not present on your farm.

Spring (March/April): Perform FEC. Your horse may or may not need to be dewormed based off these results and recommendations by your veterinarian.

Summer (June/July): For horses who were moderate to high shedders in the spring, a mid-summer FEC helps determine if an additional deworming is necessary.

Fall (October/November): September/October: We recommend all horses be dewormed with Quest Plus (moxidectin/praziquantel) in the mid-late fall. A FEC performed prior to treatment will help guide what your horse’s needs will be over the winter months.