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Signs of Intestinal parasites

The signs of worm infestation in horses can vary widely: some horses may show barely any signs; others will have severe disease and sometimes die as a result.

Signs of worms include:

  • loss of appetite1
  • poor growth2
  • weight loss2
  • anaemia, caused by redworms, which damage the blood vessels and the gut1
  • tail rubbing, due to irritation as pin worms crawl out to lay their eggs in the tail area1,2
  • coughing in young foals2
  • colic2 




  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.