If you are used to walking your dog on a leash, a harness is a valid
alternative to a collar. A harness is particularly comfortable for jogging, for use with training or retractable
leashes, and if your dog has health problems (e.g., respiratory problems).
After measuring the chest circumference, the harness must be adjusted according to the following rules:
the dog must be able to move its shoulders and front legs freely
the abdominal strap must be positioned on the true ribs of the rib cage (measure a 2–3 finger space between the armpit and the abdominal strap, more for larger sizes)
the chest strap must be positioned along the sternum
