Make sure the straps on the side are vertical when looked at from the side
To accomplish this, lengthen the chest strap to make sure that the strap with the label and the belly strap are not touching the "armpit" of your dog or else it could rub and cause discomfort
Tighten the top strap and belly strap to only allow one or two fingers space between the straps and your dog
Once you have the harness sized, slide the black pieces against the medal buckles to prevent slipping and loosening
