10/05/2026
The physics of a prong collar is simple, but it is often explained badly. A common claim is that because the prongs sit around the neck, they “spread pressure evenly”. Mechanically, that does not follow.
Force and pressure are not the same thing. Pressure depends on the force applied and the area over which it is delivered:
Pressure = Force ÷ Area.
A prong collar may spread the load through several links, but each link contacts the neck over a relatively small area. Several contact points do not automatically mean low pressure or prove that every point carries the same load.
A dog’s neck is not a perfect cylinder and the collar is not pulled equally from every direction. The leash pulls from one point and at changing angles. Movement, fit, friction, neck shape and tissue deformation alter where the load goes. Even flat collars do not produce uniform pressure on a moving dog.
This is why balloon demonstrations tell us little. A balloon is a thin, hollow, elastic membrane filled with air. A dog’s neck is a living structure made of skin, fat, fascia, muscle, blood vessels, nerves and the airway. It responds to force very differently.
So if a prong collar does not burst a balloon, that does not show that pressure on a dog’s neck is low or harmless (otherwise it would be an ineffective training tool). Equally, bursting a balloon would not prove that a prong collar injures a dog. It is the wrong physical model.
We also do not currently have good pressure mapping studies showing exactly what happens beneath individual prongs on living dogs. So science does not support claims that we know the pressure is “evenly distributed”.
What we can say is: Prongs positioned around the neck ≠ evenly distributed pressure.
There is also no evidence that dogs interpret a prong collar as a maternal correction. It's an appealing analogy. It isn't an experimentally demonstrated behavioural mechanism.
Reduced pulling does not prove that a collar is painless either. A dog may change behaviour because it learns how to reduce or avoid the pressure. That does not necessarily mean severe pain, but the sensation has to matter enough to alter behaviour.