The second edition of the CANTER Guidelines for Sustainable Equine Parasite Control was released this month, following an extensive review and update process completed over autumn and winter 2025 to 2026.
First published in 2024 by Controlling Parasitic Resistance in Equines Responsibly, CANTER is a pan-industry group established to tackle the growing challenge of anthelmintic resistance in horses. The Guidelines are a free, evidence-based resource aimed at prescribers, horse owners and the wider equine industry.
Addressing an urgent challenge
Anthelmintic resistance remains one of the most significant threats to equine health and welfare in the UK. Research continues to show that indiscriminate and routine wormer use is widespread, accelerating resistance and reducing the long-term effectiveness of available treatments.
The revised Guidelines promote a strategic, risk-based approach to parasite control, moving away from blanket or ad hoc treatment and towards targeted, evidence-led decision making.
Julia Shrubb, Chair of CANTER, said:
“A huge amount of work has gone into this revision. I would like to thank every member of the Guidelines Working Group for the generosity of their time, expertise and commitment.
Their collective knowledge has ensured this remains the most thorough, up to date and practical resource of its kind in the equine sector for UK prescribers.
Anthelmintic resistance is one of the most significant challenges facing equine health today, and I would urge everyone involved in prescribing and advising on parasite control to make full use of this resource.”
What’s new in the second edition?
The CANTER Guidelines Working Group carried out a substantial review, with most chapters updated to improve clarity, readability and consistency of style. Stronger links between related sections have been introduced to make the document more practical and easier to use in day-to-day prescribing.
The updated Guidelines support prescribers to:
- Assess parasite transmission risk using a structured, risk-based approach
- Use monitoring tools such as faecal egg counts (FECs) and antibody testing to inform treatment decisions
- Implement pasture and horse management strategies to reduce reliance on anthelmintics
- Prescribe wormers appropriately and responsibly, based on current resistance profiles
Importantly, the Guidelines are described as a live document, with annual reviews planned to ensure they continue to reflect the latest evidence and best practice.
Two additional chapters are already in development, focusing on parasite control in youngstock and quarantine management. These are expected to be published later this quarter.
CANTER is encouraging prescribers and industry professionals to bookmark and regularly reference the updated Guidelines as part of routine advisory and prescribing practice, helping to safeguard the effectiveness of existing wormers for future generations.
The revised Guidelines are available now via the CANTER website, click here.
