Sophisticated Pup Celebri-Pup Glitter Dog Collar, Medium, Royal Blue Collar Sizing: XS fits necks 5-9"; S fits necks 9-13"; M fits necks 13-17"; L fits necks 17-21"; XL fits necks 21-25" Available in sizes XS, S, M, L and XL Matching leashes are also available This collar is 3/4 inch wide