Rain or shine venture out the RC Pet Products Venture Shell Dog Coat. The lightweight rip stop lined shell is waterproof and features back darts for a contoured fit. The integrated leash access is built right into the collar allowing you to use a harness under the coat. Features a 3M reflective honeycomb patterned screen and a T-shaped chest panel that allows for greater adjustability and the. Size 8-20 feature chest panel coverage, while 22-30 have no chest panel coverage for optimal fit. To measure your dog for size use a soft tailors tape while your dog is standing. Girth equals the widest circumference around you"re your dog"s chest and the length is measured from collar to base of tail. If you dog falls between sizes, choose the larger size for more coverage. Size 8 fits a length of 8 Inch and a girth size between 14 to 16 Inch. Best suited for small breeds such as the Chihuahua.