A system for controlling and monitoring animals, the system including control devices that are able to be fitted to the animals and arranged for communication with one another. Each control device is capable of determining the position of an animal relative to a second animal as well as the distance between animals and the relative movement of animals fitted with the control device. The system of control devices also includes a stimulus device that allows stimuli to be applied to an animal or animals based on the relative position, movement and/or distance of the respective animals to one another.
