If you can figure out a way to make him bark ( make him think there is a threat)
Give him a treat after... Lets say three barks. Once he is done with three barks say "ssshhh" or "quiet" or something like that and make whatever is making him think there is a threat go away and he Should stop barking. then once he stops make sure you say the command to make him stop again and reward. It should teach him to stop. i did this with my gsd and he caught on very fast.
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Jaxx- german shepherd, born november 11th 2012
"i approached a kid and asked, what is love?
he replied, love is when a puppy licks your face.
i laughed but then he said, even after you left him alone all day..."