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