How to measure a Bernedoodle for harness?The first thing to measure is the width of your Bernedoodle’s chest- the widest part of it. Once you have their chest girth measurements, measure their neck width at the part just below where the collar would sit or above shoulders. These two measurements are the most important indicators if a certain harness size will fit your pet. To get your dog’s harness measurements, use a tape measure for most precise results, or, if you don’t have one on hand, cut a piece of string to measure and compare against a ruler to get the exact numbers.