Now that you have downloaded the open source guide, you will need to measure the following parts:

Shoulder to Shoulder: Use the measuring tape to calculate the length from shoulder to shoulder. This corresponds to the parametric called ‘shoulder_to_shoulder’ on the CAD model.

Harness to Nose: Measure the length from your dog's harness to the tip of their nose. This value will be multiplied by 2 and summed with 5mm - 7mm to get the measurement (or as desired—the added mm's are how far away the halo will be from your dog's face). On the CAD model, this corresponds to the parametric called ‘harness_to_nose’.