The Whistler Zip Line V2.0 Dog Coat has been designed for barrel chested and hard to fit dogs, but enjoyed by a wide variety of dogs. The longer Velcro straps and no built in chest panel allow for superior adjustability and fit. Coat also features generous haunch coverage for maximum weather protection and an easy harness access. The water resistant treated nylon shell and fleece lining offer your dog comfort in a wide variety of weather conditions. To find the right size for your dog use a soft tailor’s tape to measure the girth and length while your dog is standing. If your dog falls in between sizes, choose the larger size for more coverage. Girth equals the widest circumference around the dog’s chest and length is measured from collar to base of the tail.