Soft Lines Floating Dog Swim Snap Leashes - 1 / 4" Diameter x 20 Foot are used by very small dogs usually weighing less than 10 pounds. You would need the Soft Lines Floating Dog Swim Slip Leashes - 1 / 2" Diameter x 20 Foot. 1/2" diameter swim leashes are used by larger dogs usually weighing over 50 pounds.
