If you have zapped him and it didn't phase him .......turn up the juice and pure it to his rear till he cannot stand to trash.
Only time I have seen tri tronics not work..is when the handler hasn't laid into them hard enough to make em stop.
Also save your money on the scent breaks.....unless you have a very mild case of trashing.
Them hard headed dogs will drink that scent breaker like a homeless man will cheap whiskey.