1.) An 'e-collar fence' does not usually work. It's very easy for a dog to run through it  (the dog's body was over the property line).
2.) This dog was previously classified as a potentially dangerous animal.
3.)  A dog that has been trained as a bear dog can be extremely dangerous if improperly trained.
 There is no such thing as "firing a warning shot" - if you feel threatened enough to pull your gun out, you are shooting to kill. That's Alaska 101. 
      I am an animal lover - with two dogs of my own - but human beings (and animals) have a  RIGHT TO LIFE. We are allowed  to defend ourselves and our property from  dangerous animals...and dangerous human beings. No exceptions. That's Alaska 101. 
  I do not know all the facts, and understand why people would be angry about a dog being shot in its own yard, but we don't know the full story.