Deworming Schedule

Greene Lewis and Associates Deworming Recommendations


  • First deworming at 2.5 – 3 months of age with fenbendazole (Panacur or Safeguard)
  • Deworm again at 6 months of age or just prior to weaning with Ivermectin
  • Starting at 8 months of age begin following the adult rotational deworming schedule (listed below) until 2 years of age.
  • At 2 years old, the rotational schedule should be discontinued and the stragetic (test and treat) method should be started.


**Remember that moxidectin (Quest) should not be used in foals less that 6 months of age.**


Adults/ Pregnant Mares

  • Strategic or “Test and Treat” method – Fresh manure samples (1-2 fecal balls) should be collected, placed in plastic bag and put in the refrigerator (not the freezer). Samples need to be brought into the clinic within about 24 hours of collection.  Results are expressed as eggs per gram (EPG) of manure. Deworming instructions will be based on the EPG results. Recommendations on when the next fecal egg count should be performed will also be made.


  • Rotational Deworming Schedule

(Please note that this was the recommended method for many years, but recent studies have shown that the strategic method is more successful in most situations with the exception of being followed from 6 months to 2 year of age.)

January ——– ivermectin/praziquantel
March ———- pyrantel pamoate; Semi-annual fecal egg count
analysis should be preformed 10 days post deworming.
May ————- ivermectin
July ————- ivermectin
September —– double dose of fenbendazole granules once a day for
5 straight days. Semi-annual fecal egg count analysis should
be preformed 10 days post deworming.
November —— ivermectin


Daily Dewormer

  • Perform a fecal egg count and follow deworming recommendations prior to starting a daily dewormer.
  • Horses on a daily dewormer such as Strongid C2X will also need twice yearly deworming with:
January and July —  ivermectin/praziquantel

Monitoring Parasite Levels
Monitoring parasite levels is important in determining the effectiveness of a parasite control program. Farms on a rotational parasite control program should take fresh fecal samples from each enclosure and submit them to their veterinarian semi-annually (spring and fall). The fecal sample should be collected ten days after the last deworming. Fecal analysis can be performed more frequently on farms entering parasite control programs or if parasite problems are suspected.



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