Retired Breeder, Hestia is modeling our gray GDB dog collar. Featuring our colorful 3 stages of a guide dog design and our logo in black on a gray colored collar and ribbon. Career Change dog, Supreme is modeling our royal blue GDB dog collar. Featuring our colorful 3 stages of a guide dog design and our logo in orange on a blue collar with green dogs. One size only - fits 19" to 32". Fits most medium to large adult dogs.