An ActionAid programme in the Sanaag region of Somaliland provides basic animal health care to the pastoral communities living in the area. Participatory methods have been used by the project staff to build up a more detailed picture of the herders' lifestyle, particulary management of communal resources, animal husbandry practices and methods of managing disease. This article describes mapping exercises which were carried out to chart the seasonal migration patterns followed by different groups of pastoralists in the region. Information about seasonal migration patterns confirmed that herders are likely to be in a certain area during a particular season of the year. This knowledge assisted with the planning of drug distribution, making it compatible with the herders' needs and seasonal location.