OCSOSO Dog Outdoor Harness Reflective Design for Medium or Large Dog No Pull Best Front Range Pet Vest This safety pet harness with reflective stripes for Good Visibility at night time walking and Tough Handle for Easy Seat Belt Attachment while riding in your car. It is pet dog harness can handle strong pulls and will not hurt your dogs. There are two Leash Attachment Points: Zinc-alloy D-ring on dog's back and webbing with Zinc-alloy O-ring on dog's chest. Adjustable harness straps to provide a comfy feeling for your dogs chest, but still handle strong pulls. There are 5 sizes for your options. This Dog harness is designed to fit all sizes of dogs. Please measure your pet carefully and order the right size. Please measure your dog's chest circumference with a soft tape, at whatever point gives the widest circumference of front chest. Be sure to set aside 0.7- 1.1 inches(2-3cm). Size X-SMALL: 13-17 inches(33-43cm);SMALL: 17-22 inches(43-56cm); MEDIUM: 22-27 inches(56-69cm); LARGE: 27-32 inches(69-81cm); X-LARGE: 32-42 inches(81-107cm).