https://www.royaldogcollars.com/size/s-us-neck-size-8-to-14-in-and-girth-12-to-20-in-eu-neck-size-20-to-35-cm-and-girth-30-to-50-cm/https://www.royaldogcollars.com/size/m-us-neck-size-14-to-22-in-and-girth-18-to-28-in-eu-neck-size-35-to-55-cm-and-girth-45-to-70-cm/https://www.royaldogcollars.com/size/l-us-neck-size-18-to-26-in-and-girth-22-to-35-in-eu-neck-size-45-to-65-cm-and-girth-55-to-90-cm/https://www.royaldogcollars.com/size/xl-us-neck-size-28-to-35-in-and-girth-28-to-42-in-eu-neck-size-70-to-90-cm-and-girth-70-to-105-cm/