I have one idea, this will either work, or you will absoulutly blow the dogs mind.
Go to the local trap range, chain him to a post and let him throw a "cow eyed fit".Don't talk to him,or go near him till he calms down.I have done this a few times with dogs I purchased,(2 were fixed, 3 wrecked, and culled) He will learn not to be scared of gun fire or be "wrecked for good".
Either way, he is getting a fair chance before the final decision.
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"IF YOU'RE GONNA TALK SMART,YOU BETTER RIDE A FAST HORSE"