Small - 12 to 18" | Width - 1" ||| Medium - 18 to 22" | Width - 1" ||| Large - 22 to 28" | Width - 1" Wild Green Collars are much gentler form of correction than choke collars. More comfortable than standard choke collars. Prevents escaping when fitted properly.  The inner mesh design is comfortable and breathable to protect your dog's skin,reduce strain and the risk of getting hurt.Service dog vest come with a 5cm nylon dog leash that made of strong 1/2-inch diameter rock climbing rope with soft padded Denim..