Mercari Shipping Size XS is indicated, but it runs large. Please refer to the following measurements: Dog Puppy Harness Body harness XS Walking Care Pet Pet supplies Dog supplies Rescue dog Beloved dog Neck: Approximately 30-35cm Chest: Approximately 35-45cm Belt width: Approximately 2.5cm The back of the harness has a cushion-like material, which is gentle on the back♡ I bought this, but it was too big for my dog, so I'm selling it. It's only been tried on (almost new, unused), but it's been stored at home by a private seller. Please check the photos and only purchase if you are not concerned. Please refrain from purchasing if you are sensitive to these issues. Please ask any questions before purchasing in the comments. Thank you for your interest!