A leash includes at least one light emitting device that is configured to move when a lead line moves to permit the focal point of the light emitted from the light emitting device to be automatically-aimed toward a pet in response to motion of the pet. The self-aiming of the light emitting device may occur automatically so that a user holding the leash does not have to do any adjustment of the holding of the leash to cause the light emitting device to be aimed toward the pet as the pet moves during a walk.