Use this listing for custom colorways of our martingale collar. Check box under size selection that says 'customize this item' and leave a note with your color preference - please specify color selection when ordering as MAIN + ACCENT. MOQ 2 per size/colorway. Sturdy nylon webbing and brass hardware make a fashionable duo in our classic martingale style collar. Martingale collars fit loosely on the neck and tighten gently when pulled, providing more comfort for dogs and more control for owners. XXS (3/4" wide): neck size 9"-11.5" XS (3/4" wide): neck size 11"-15" small (1" wide): neck size 11"–15" medium (1" wide): neck size 14"–18" large (1" wide):  neck size 17"–23"