(((hugs))) I'm not up on the whole situation...but you can't live this way, in any form or fashion! Take what dogs you can and leave. Dogs are dogs, and though wonderful companions, are not any where near the value of your life. If you get shot, severely wounded, you would say, Why didn't I leave? Let's not go to that point.

Does the guy have a permit? Have you spoken to the police about the guy's display of the weapon?
Too bad you don't have pics of him abusing the animals, the ASPCA could haul him off for you, gladly!

Get out, get out NOW. Once you're out you can think clearly and not from all that fear and frustration.