It’s extremely important to teach dogs not to pull on any equipment unless it’s a specific harness designed for the specific pulling jobs such as canicross or weight pulling etc. But the reason that I use a harness is the same reason I use a safety belt in the car (which goes across the chest not the neck) in case there is an emergency, and I would suddenly have to pull my dog out of the way of some thing like a car that comes up on the sidewalk or the dog sees someone they haven’t seen in a lon