Guacamole BioThane® CollarOur BioThane collar is available in sizes XS XL, to fit all dog sizes. Our collars are hand made to order in our workshop by the sea in Brighton, UK. We recommend to measure your dogs neck prior to selecting your collar size. For practical reasons our collars are made with minimum strap excess. Therefore if your dog is in between collar sizes (i. e. at end measurement of a smaller collar size), we recommend to go up a size for a better fitting and