A system for controlling and monitoring animals, including control devices (10) that are fittable to the animals and arranged for communication with one another. Each control device (10) includes means for determining the position of an animal relative to a second animal, means for determining the distance between the two animals, and means for determining movement of the animals relative to one another. The system also includes stimulus application devices (12) arranged for selective application of a stimulus to an animal based on the relative position, distance and/or movement of the animals.
