Biosecurity refers to measures designed to limit or stop the spread of disease. It is important that we consider the risk of diseases in our horses and how we can help to reduce spread to safeguard health and welfare. Biosecurity is relevant now more than ever, with increasing global networking and movement of horses and changes in climate increasing the risk of transmission of both infectious diseases that are already present and also introduction of new or exotic diseases. Biosecurity may be used to protect the individual or yard or may be considering a more national or even global herd health approach. There are several simple strategies that can be employed to help prevent the spread of disease including; maintaining good hygiene practices, using quarantine and isolation for new or ill animals, vaccination and monitoring general health.