Equine Deworming

Equine Annual Deworming Recommendations

Based on the recommendations published by the American Association of Equine Practitioners


Deworming recommendations have changed in recent years and the equine practitioners have stopped recommending mass deworming of horses at regular intervals. Mass treatment of horses in this fashion has helped breed a population of worms which are resistant to anthelmintics (dewormers). Targeted deworming is now recommended where horses are dewormed based on the results of regularly performed fecal egg counts.


Mature horses: Perform fecal egg count twice yearly and deworm as instructed by the veterinarian. Guidelines are listed below. Generally we recommend twice yearly deworming (performed after the FEC) with Ivermectin in the spring and Moxidectin in the fall.


Pregnant mares:

Perform regular fecal egg counts (FEC) as described above.

3 months of gestation deworm with Ivermectin/ Praziquantal product such as Equimax

Perform FEC one month before foaling and deworm as instructed

Deworm the day of foaling with Ivermectin (prevents spread of Strongyloides westeri in the mare’s milk to the foal)



Foals are particularly susceptible to roundworm (Parascaris equorum) infections which can cause impactions and even fatal disease in young horses. This is also a species of parasite that is resistant to many available dewormers. It is important to perform fecal egg counts on a regular basis and follow deworming instructions.


Day 1: Deworm mare with Ivermectin (S. westeri)

2-3 months:    Perform fecal egg count, deworm with Panacur/Fenbendazole (10mg/kg which is a double dose)

                                *FEC 10-14 days after deworming

                                *At 2-3 months roundworms begin their larval migration

Weaning:         (6 months) Perform fecal egg count and deworm with Fenbendazole or as instructed

9mos:              Fecal egg count, deworm with Ivermectin/ Praziquantal combination product

1 year:             Fecal egg count, deworm with Moxidectin (Quest)

Moxidectin is not recommended in animals less than 6 months of age

For further information on specific parasites and deworming recommendations please refer to:

American Association of Equine Practitioners Website

If you have any questions feel free to call the office or speak to one of our veterinarians the next time they come to your farm. Fecal samples may be dropped off at the office any time during our office hours or picked up when we come to your farm. For the full AAEP parasite control protocol information, click HERE.