Medium-Sized Dog Harness: The medium-sized dog harness has a fit chest girth between 20 to 25.5 inches. We recommend that you measure the widest part of your dog’s chest to get its chest girth and choose the right girth fit based on that. If your dog fits in two sizes, we advise that you go for the larger size while leaving a 1-inch space. It’s recommended for medium size dogs like Border Collie, Pit Bull, Boxer, Shiba Inu, and Welsh Corgi. | Comprehensive protection with Digital ID Tag: You can get a digital ID tag in the box. There is no additional purchase that increases waiting time. It only takes 30sec for registration. If your pet gets lost, the finder can scan the tag to check your contact information. Doctors can access the dog’s medical history and allergy history in the case of emergencies. | Breathable yet comfortable: The soft, double-padded, breathable mesh is extremely comfortable for dog, making it a relaxing walking, running and resting experience for your furry friends and you. Pawaii dog harness features 4 adjustment points, making it easier to adjust the size for better wearing comfort. | Extra safety from day to night: The high-brightness reflective strips ensure no matter from which angle, you can see clearly. Escort your safety, whether at day or night. Besides, the top-mounted handle keeps your dog by your side always. | Extra longer safety: The dog harness features sturdy buckle, high-density webbing, zinc alloy D ring that can withstand stronger tension and prevent explosion impact, providing your furry friend extra longer protection.