1. Unfasten all buckles. 2. Place the harness on dog's body, fastening buckles around neck and chest. 3. Adjust two chest straps for a snug fit, ensuring allows freedom of movement. Size information:

rabbitgoo Dog Harness for Large, No Pull Pet Harness with 3 Buckles, Adjustable Soft Padded Vest with Control Handle, Walking Reflective Pet Vest for Large Dogs, Blue, L