An apparatus for running, exercising, leading or walking a dog comprising an arc bar having two ends, each end comprising an extendable cord extending from inside the arc bar and terminating in an attachment means, the extendable cord biased in a retracted position inside the arc bar and a retention member attached to the extendable cord distal from the attachment means which acts to limit extension of the extendable cord outside the arc bar and prevents transfer of force to the extendable cord on the other end of the arc bar. The present apparatus enables a dog to run within a defined range of a person or bicycle while limiting transfer of force from one side of the apparatus to the other during use.
