Your dog’s chest girth plays a major role in harness sizing, as it will tell you how wide they are. For measuring, you’ll want to use a flexible fabric tape. To ensure an accurate chest measurement

1. Measure your dog standing up.Measuring the chest will be easier and more accurate if your dog is standing.

2. Make sure the tape isn’t too tight. The tape measure should be snug but not tight. As a rule of thumb (pun intended), you should be able to fit two fingers between the tape and your dog’s body.

3. Note the measurement. This may seem like a no-brainer, but having a notepad or your phone on hand to record the dimensions will help you keep the measurements accurate.