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Pin woven ribbon in center of webbing and stitch down on both sides.
Separate your plastic buckle. Fold over one end of your webbing, looping one end of the buckle and pin in place. Loop d-ring onto webbing next and pin again. Stitch.
Fold over 4" on other side of the webbing and loop through remaining buckle piece. Pin. Check for fit on your dog before you stitch this side, in case you need to make any size adjustments. Make any necessary changes and stitch.