User Instructions: 1. Connect: First snap the Shoulder Metal Buckles up to connect the 2 pieces. 2. Put-on: Slide your dog's head through the front opening, with the side with the handle facing up. The front hook-and-loop panel should be on your dog’s chest. 3. Adjust: Adjust the Chest and Belly Straps accordingly to fit your dog's body. 4. Secure: Buckle up on both sides of the belly 5. "2-finger Rule": You should be able to fit Two Fingers between your dog's body and any part of the harness. Tips on Adjusting the Straps: 1. To tighten the Neck straps, feed the strap into the slider, bringing the slider closer to the Front Leash Attachment. Reverse for extending the straps. 2. To tighten the Belly straps, feed the strap into the slider. Reverse for extending the straps.