Just lay it flat under you dog, wrap it around the and then clip the straps up around the neck of the legs. My dog is a 17lb bichon.

The straps and buckles look like they would be super durable, but a lot of th seams and stitching only gets the very edge of the straps. Couldn't even test it or try on because the straps were broken.

This broke while hiking my dog who had only worn the harness a total of 4 times… the clips break easily. The plastic buckles on this product are junk. Decent concept, poor execution.