Parasite disease management is a key responsibility for veterinary professionals, and the RCVS Practice Standards Scheme requires that practices have an evidence-based parasiticide policy. However, the area is complicated because cats and dogs need tailored management, there is an overwhelmingly large choice of parasiticide products, and very intense promotional activity by drug companies. This module is the introduction to a series of modules on management of the key parasites that affect cats and dogs in the UK. The modules will help with the development of an evidence-based parasiticide policy.