Size of collars: 20-32 inch 40 inch 23 inch 34 inch 36 inch Small 25 inch 15 inch 20 inch 38 inch 27 inch 16-24 inch 21 inch large 24 inch 29 inch 18 inch 26 inch 31 inch 16 inch 39 inch 28 inch 33 inch 17 inch 22 inch medium 30 inch 35 inch 14 inch 19 inch 37 inch 32 inch
Use: All weather Police/Military K9 training Walking and daily use For working dogs Search & Rescue Obedience training Training