Muttluks 3-Layer Belted Winter Dog Coat, Size 20, Green Tough coats for tough winters with three layers of warmth and versatile fit Nylon exterior with lofty inner core and faux Sherpa interior Versatile fit Machine wash and dry For accurate sizing, measure in-Inch from the back of the collar, along the dog's back, to the base of the tail. The length is the appropriate size