[header] How to measure a dog for a harness [title] Get a measuring tape. [step] While harnesses are often sold by the weight of a dog, it is good to use a measuring tape to get a more exact measurement. Combining your dog's weight and measurement in inches or centimeters will allow you to find the best possible harness size for your dog. 
[substeps] If your dog wiggles around a lot, then you may want to ask someone to help you. Have someone hold the dog's collar to keep him still while you take the measurement.