These sweaters are 100% acrylic and come in sizes 6"-16". Machine washable. To determine size, measure from the base of the neck to the base of the tail. For dogs with a little more weight or fluff, go up a size.
HOW TO MEASURE YOUR DOG: Sizes refer to the top line of the dog. The top line is the measurement from the base of the collar to the base of the tail along the back as shown above. So if your dog measures 14", most likely the 14" sweater would fit. However, you do need to take into consideration if the dog has a lot of fluffy hair or is overweight......then you may want to go up a size.