Derby Original 600D Waterproof Dog Blanket Blue, Small Keep your canine companion warm and dry. Available in sizes and colors to accommodate most dogs. Sizes are measured from base of the neck to base of the tail. Sizes: Small (13.5") REFERENCE TO SIZE CHART ENCOURAGED - These blankets run larger than other brands. For the best fit, please measure your pet and refer to the size chart before placing your order 600 Denier Ripstop Waterproof Outer shell 150 grams polyfill insulation for winters and breathable 210D lining for comfort and durability Adjustable elastic belly wrap with quick-grip closure Front buckle closure Shoulder gussets for freedom of movement