IMO - the OP doesn't need a prong. The OP needs to exercise his dog - not by walking it on a leash, but allowing the dog to spend the energy that it has. Physical exercise - mental exercise. Whatever he is doing now, he needs to increase it. Clearly it isn't enough.
Hondo Von Dopplet L Bauernhof "Hondo"- GSD
Lilie's Tug McGraw "Tug" - Golden Retriever
Maggie - Mini Dachshund (Rescue)
Lonestar Pivo - Texas Blue Lacy
Ashe - Barn Cat
Katie / APHA