Abstract: An apparatus, a system and a method have a speed-limiting braking mechanism. The apparatus may use a leash to limit a velocity of movement of a pet relative to a velocity of movement of a user of the apparatus. The speed-limiting braking mechanism within the apparatus may prevent the relative velocity from exceeding a predetermined threshold without abruptly stopping unwinding of the leash. The speed-limiting braking mechanism may have a rotatable pinion component connected to one or more brake shoes. The leash may be connected to a spool. Unwinding of the leash may rotate the spool, and rotation of the spool may rotate the pinion component. If the relative velocity exceeds the predetermined threshold, the one or more brake shoes may engage a braking liner to maintain the relative velocity at the predetermined threshold.