Size M: Chest: 15.0 In, Neck: 10.0 In; Back: 12.5 In;. Very cute sweater in classic snowflake and reindeer pattern.Can't wait for your dog to wear its own sweater to all the upcoming festival!. Designed with soft and warm materials, and it's very light and comfortable for dogs and cats. As a sweater, it is easy to get on and get off. You can change various of beautiful sweater quickly and covenient. Please pay attention to measure the chest circumference of your pet. It's a wise decision to choice the larger one. For example, you measured your pet very carefully,and you still can't sure purchase the L size one or the M size one, you'd better purchase the L size one.