Love Pets Love PetsLove Christmas Red Nose Rudolph Dog Clothes Cat Sweaters Pet Jerseys Clothing Gear Coats Apparel M:back length 15.4", neck girth 9.8", chest girth 13.4". Measure your dog from the base of the neck to the base of the tail for back length. A wonderful pet clothes made by the highest quality acrylic fibers for ease care and durability. Machine-washable with similar color items in cold water on the gentle cycle. This sweater with special designs for Christmas is which they will love! Please allow little difference in size measurement or color due to different measurement tool or light environment