I know u said shock therapy, but that was with a collar. Have u tried a cattle prod? I had an issue with a bitch dog, a guy said he could cure her, so he took her, and sure enough, he cured her. Put her and another aggressive bitch in a small dog box and took a prod and lit both their a$$es up. A few treatments and both were cured. A prod puts out a lot more current than a collar and will put them to their knees most Ricky tick, especially a jolt u der the jaw or just behind the ear where head meets neck. Be careful though and don't stay on them in the head area, ull scramble their nervous system and could cause serious and irreversible damage.
That was my first idea after seein that the collar didnt work............light him up, turn the electricity up to "memory reset" and fry his butt when he acts ignorant......... If that doesnt work I can only see 3 other possible solutions to you problem. 1) neuter him and hope it works 2) hunt him solo 3) dirt nap
