This vest is quality made of two layers of weather resistant denier fabric. Your K-9 partner will be highly visible and recognized as working in this vest. The cape vest attaches around the dogs girth with a quick release snap buckle. There are no flopping belts on this vest which tend to catch on objects. The cape vest fits over the dogs head and the chest is also adjustable. This cape vest is designed for light duty work, comfort and is not over restraining to the dog because it has only one strap around the girth of the dog. The vest comes with a Service Animal Patch on the vest.  Small Dog: Vest: Girth Sizes : 1XS=21-24"... 2XS=18-21"... 3XS=15-18"... 4XS=11-14" Regular Dogs Cape: Girth Sizes are as Follows: Small=26-30"...Medium=30-34"...Large=34-38".   **Note on Patch Choices: Service Dogs have public access rights under the ADA law to enter public property with their disabled handler. Therapy Dogs do not have ADA public access rights. A Therapy Dog is one that meets the needs of others, such as visiting nursing homes, hospitals, reading groups, etc. A dog that is therapeutic to its disabled handler is a Service Dog.