Instructables user Doggie Stylish writes:

The smaller a dog is, the harder it is to find them a harness that will fit them properly. This tutorial will show you how to make a custom fitting small dog harness using grosgrain ribbon. The materials used for this harness are suitable for small dogs weighing 10 pounds and under only! If you want to make this style of harness for a larger dog you must use a sturdier material like nylon webbing.