Keep your dog warm and comfortable as the temperature drops with the Climate Changer fleece dog jacket from Ruffwear. Provides an additional layer of warmth and insulation from the elements. Recycled fleece fabric is ideal for cold and clear conditions while trail running, hiking, and for in-town excursions. Integrated reflective design is easy to see in low-light conditions. To determine correct size, measure your dog's girth (the widest part of the rib cage.