I made a diaper belt for my boy about 4 inches in width and then I measured around him and added about 3 inches. Then added velcro at both ends. I buy mens depends diapers, they look like big period pads, but they work wonders because they have the sticky on the underside and it stick to the denim belt I made him. I then wrap it around him and keep it on him all day except for when I take him out to go. That way, when he marks, it doesn't go all over my house. They width and length is determined by the size of the dog. They are super simple to make. Just a big rectangle really.