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