Get a 2 inch leather collar and put it on the dog and then place the prong above this on the neck so it stays in place. You can have 2 leashes as well and only use prong for corrections. Also if the dog does not respond to the prong you can hold back with the normal collar and not injure the dog's neck.
Personally I prefer a simple 2 inch collar on it's own set tightly on the dogs neck under it's chin. Gives total control of the head.