So cute! My 10lb Shih Tzu's neck was 9" so I ordered M but I should've bought a L. It's very snug on her and a little short. I'm still satisfied with the product because you can't beat the price. I would buy again, but a size up regardless of measurement. :)Shipping took 2.5 weeks. Medium comfortably fits my 6lb Chihuahua. She has a 9" neck, 15" chest and 10" length. They are super cute. Some of the seams are not sewn correctly but it does not interfere with wear.This is very cute, but it did not fit my 7 lb dog and I ordered her a Medium. It was too tight to even get on her.My 10 pound Shih Tzu fits the large perfectly. Read the sizing carefully. This is so cute. I love that the tutu fluffs up so much. The entire dress is much cuter than I had hoped considering what I paid. I’m pleasantly surprised. I may order the other colors too. Package arrived within the promised delivery window but was sooner rather than later.I need the sizes ran small so instead of a small I ordered a medium. The medium fits very snugI bought it for my 5.5lbs yorkie and it was it a bit small. She’s usually a small xs.The dress is very cute. A little long on the skirt & poofy and some what large.I would have given this dress 5 stars if not for the size The size is way too small. I have a 10 lbs. Shih tzu and ordered large to be safe but it is still way to small.