When using the prong collar, it’s important for the collar to be snug but not too tight. It should not hang off the dog’s neck, nor should it be able to sit at the base of the neck, unless that is the position that works best for your dog.
In my experience, I have found the best position for the prong collar to be mid-neck or higher. The higher up the neck the collar sits, the less pressure is needed to communicate with the dog, whether it be by applied pressure or by use of a correction.
In the video above, I show the difference between too loose and “just right on my dog, Dante.