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The main types of worms that affect horses are:

  • Redworms (the Strongylus group) – the most common parasite. These include large redworms (e.g. Strongylus vulgaris) and small redworms1,2
  • Threadworms (Strongyloides westeri)1,2
  • Roundworm (Parascaris equorum)1,2
  • Tapeworms (the most common is Anoplocephala perfoliata)3
  • Pin worms (Oxyuris equi).1


  1. Queensland Government Department of Agriculture, Fisheries and Forestry. Worms in horses, January 2012.
  2. Robinson S. Worm control in horses. PrimeFact 976, February 2010. NSW Government Department of Industry and Investment.
  3. American Association of Equine Practitioners. Tapeworms. April 2012.