I have to start by saying this was a darling costume, and my dog got so many compliments! However, i originally purchased this costume for my 30 lb sheltie, so i ordered a medium. It turned out this was way to big for him, and i used it on my 60 lb lab, and it fit perfectly. so i am not sure about how the sizing works, i measured as the size chart suggested. but overall , i was thrilled with the costume.
Rating: [4 of 5 Stars!]