Passion, Otis is 7 pounds and we got a small, but I wish I got a medium instead. I think if Sully is 9 pounds, he might be more comfortable in a medium. Check out the first picture where I have both ends unzipped. You can see the top of Otis's head and where his rump ends. He's taking up the entire length of the bag, and when I zip it fully up, he has to curl to fit. |