Welcome to the forum. Good luck with the search, I really hope you are reunited soon with your dog. It takes some callous B'stard to do a thing like that
Get yourself over to Garlands shooting ground or Doveridge and see if their notice boards have anything on. What are you interested in? rough shooting? pheasant?
I heard it on our local radio station. Seems that the shotgun was legally owned. My sympathies goes out to anyone who knows or is related to the people who have lost thier lives.