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Different worm species typically only affect specific animals, meaning they can only survive and complete their lifecycle in certain hosts. For horses, the most significant parasitic threats are redworm, roundworm, and tapeworm—these should be regularly tested for. Additionally, a parasite control plan may need to include monitoring for pinworm, bots, lungworm, and liver fluke.
Each type of parasite has unique traits, requires specific treatments, and may pose seasonal risks. Understanding these differences is key to effective management—learn more about each parasite and how to control them here.
BVA (British Veterinary Association) guidelines on worm control for grazing animals
Leading experts now agree that effective worm control begins with regular testing, only administering wormers when necessary based on the results.
Horse worms are increasingly developing resistance to certain worming drugs, particularly those that have been in use for many years. This means routine worming alone is no longer a reliable solution for keeping horses parasite-free. A more effective approach is to identify which horses actually need treatment and target wormers accordingly—especially for seasonal risks like encysted redworm, bots, and pinworm. By using wormers only when necessary, we can help maintain their effectiveness for when they are truly needed.
Whether you have one horse in private turnout or manage a busy yard, a targeted worm control strategy is the best approach.
How does a worm test programme work?
For a mature, healthy horse, worm testing follows a straightforward routine. A manure sample is collected around three times a year to check for redworm and roundworm, while a saliva test is done twice a year for tapeworm. If test results show no issues, worming is not required. The year should end with a winter treatment for potential encysted redworm or a blood test by your vet.
Foals, young horses, neglected, or older equines may need a more tailored approach with closer monitoring and additional treatments.
Click the link below for more information on worming mares and foals.