This leather basket dog muzzle is made for Boston Terriers and Pugs. It has a full leather basket muzzle which is designed for comfortable wear for the dog. This basket muzzle allows for opening of the mouth for panting, drinking and treats. Size 1 The size 1 will fit most standard size Boston's with a 8 to 9 inch snout circumference and with a 4 to 4-1/2 inch jaw line. The neck strap on the size 1 will fit dogs with a 12 to 14 inch neck. Size 2 The size 2 will fit Large Boston Terriers and most Pugs with a 9 to 9-1/2 inch snout circumference and with a 4-1/2 to 5 inch jaw line. The size 2 has a little more room for large Boston Terriers and Pugs that have a wide face. The neck strap will fit dogs with a 13 to 15 inch neck.