I ordered both small and medium. The first picture is the size small sweater,

It is very tight. The second and third pictures are the medium. Lots of room, but a little too much room and very long. It might get soiled when he needs to potty. Unfortunately my Maltese falls in between both sizes. I believe it is because he has a very thick and full coat, so even though he is pretty small (7-8 pounds), his hair adds a lot of volume, but not enough to fill a medium. Customer service worked with me to find the best size and made accommodations to allow me to shop confidently with Foggy Dog. I did not want to just return the sweater since I loved the quality of the sweater and how cute the print looked on my pup. My inquiries were answered promptly, with courtesy, and with kindness. So even though my purchase did not go as planned, this company stood behind its quality product and excellent customer service. Highly recommend the sweater and the company.