Nylon leash matches the famous Puppia Soft Mesh Harness and any of the Puppia mesh harnesses. Pink matches any of the Pink Puppia harnesses. Sky Blue matches any of the Sky Blue Puppia harnesses. Black matches the camo harness and any of the Puppia harnesses trimmed in black. All other solid colors match the same color harness. Small is 45" long and 1/3" wide. Only suggested for tiny dogs under 5 pounds. This leash is VERY narrow, please see measurements before placing order. Medium is 47" long and 1/2" wide. Suggested for dogs under 11 pounds or for leash training larger dogs or puppies. Large is 57" long and 3/4" wide. Suggested for dogs over 11 pounds. Please read the above measurements carefully, exchanges on this item are not included in free exchanges. Please call us if you need help matching a harness.