herd control methods and systems are described that can achieve great benefits over conventional methods when applied to animal and range management . the methods allow much greater animal density than is possible by other means of intensive grazing . a herd can be turned out in a large pasture or unfenced rangeland without dispersal . the herd constantly moves to find new forage and water without the negative consequences of uncontrolled grazing , and fencing can be reduced or eliminated . the methods use devices attached to some or all of a plurality of animals to replicate a herdsman rather than a fence . these herding devices are equipped with components for measuring the distance to neighboring devices . a stimulation component actuated by the processor applies a stimulus , such as a sound or an electric shock , if the animal is too far from the herd .