This dress is suitable for most small and medium dogs. About the size, you can measure the neck girth and chest size of your dog and choose the size according to the size table showing in the pictures. Which size should I choose for my puppy? Please choose the size according to the size table in pictures above. Different designers and manufacturers use their own size charts. Don’t buy a particular size because that is what you always buy in a pet shop or online store. Always look at the size chart for chest girth and neck size and confirm the size before you commit to buy. If any of the measurements are between two sizes, please choose the larger size. The jacket is made of 100% polyester with fleece inside. It can make your furry friends look amazing and feel warm in winter or some other cold days. It can be worn both in daily life and parties. Due to the high quality and the fashionable design, your puppy will look gorgeous in the crowd. And of course, your puppy will be happier every day. In a word, you are not gonna disappointed. Trust me!