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