Top Tips For Horse Worm Control
Horse worms are evolving to become resistant to some worming drugs, especially those which have been around for a long time. This means that we can no longer rely on keeping horses worm free purely by giving them wormers.
Not long ago there was a time when we would dose our horses with the same dose a couple of times a year and that was that. Nowadays worming advice has changed. Good worm control starts with using worm fecal egg counts and tests, only adding wormer doses as they are needed. However worm fecal egg counts can’t detect encysted small redworms or tapeworm eggs, so it is important to treat for these parasites at certain time points during the year.
Pasture Management
One thing that can be done without buying any product is good pasture management. Regular removal of dropping (twice a week at least) will reduce the risk of worms in the pasture.
(Handy tip: Horse manure is a great fertiliser around the garden especially around shrubs and flowers! )
Group horses of a similar age together, younger horses are more susceptible to worms and ensure they have plenty of space. It is recommend to allow an acre per horse.
Redworms
The most important time of the year to treat for small redworm is in November and again the following February. Doing so will prevent mass emergence in the Spring. Redworms are now recognised as the major parasite concern in horses. Fenbendazole, the active ingredient in Panacur Oral Paste or Moxidectin in Equest are the best ingredients to treat the small redworm.
Another parasite which affects horses is the tapeworm. The optimal time to treat for these is in March and September. For tapeworms Praziquantel or Pyrantel are best. Products like Eqvalan Duo, Equimax or Equest Pramox contain these active ingredients which will treat for tape.

Horse Worm Control in the Grazing Season
During the grazing season of April to October fecal worm egg counts should be carried out regularly. A phone call to your vet will get you some great advice. Doing so will allow you to recognise which of your horses have a heavy worm burden and which ones don’t need to be wormed at all.
As said previously it is recommended to treat for tapeworm in September and in November for the small redworms. The other prevalent parasite in horses is bots. For bots use an ivermectin based product, one like Bimectin or Eqvalan one that contains moxidectin like Equest.
One tip I would like to add to aid in your horses health is to give a course of probiotics around worming time. Wormers can be, as any drug can have a negative effect on the gut flora. Products like Precision Probiotic will help maintain a healthy gut in your horse.
In Conclusion
- Treat for redworms in November and February
- Carry out regular faecal worm egg counts throughout the grazing season.
- Avoid the using the same active ingredient year after year.
- Good pasture management will reduce your worm count further
- A probiotic will help your horses gut health before and after worming.