This is a walking support harness for pet dogs developed by Tonbo Gakusei-fu. It supports the walking of dogs with weakened leg strength. The sturdy stitching makes it easy to assist even large dogs. Your dog can sleep while wearing it. The size is M. A Labrador weighing about 26kg wore it. Chest circumference: 73-82cm Front leg circumference: 46cm Back length: 40cm Thank you for looking.