Yes it is.
The sheriff is a mental case. He's just taking "the edge off his Jones" by shooting dogs. If I were a Guardsman in the situation that they are in, I would not want to be hearing close or distant gunfire of a random nature from anyone, including the local LEO's.
That's a really good point.
"If I were a Guardsman in the situation that they are in, I would not want to be hearing close or distant gunfire of a random nature from anyone, including the local LEO's."
Interesting point... if the National Guard heard the shots (only 3 blocks away) why weren't they investigating the source of the gunfire?