F##king Idiot neighbor with an pellet air gun.

I have a elderly dog. she is not aggressive and can only walk. She has just in the last two weeks started wandering out the acreage. We usually keep the gate closed after dark.
Today she wandered about 50 feet across the street to the neighbors who have a dog. He is a largeish terrier who is very noisy and who also goes through their invisible fence on occasion.
I would never hurt any of my neighbors dogs if the got in my yard and they have. 
I was about 50-60 feet away from her at the end of my driveway calling her. The neighbor heard me calling her. He came out yelled once and started shooting at her with some kind of air gun. I went to to grab her collar, as she was coming to me in on about ten feet on his property when he started shooting again. I told him "If I ever saw him shooting the gun at an animal again I would call the cops."
Shooting domestic pet animals is considered animal cruelty. He has my phone # he could have damn well called me, or said to me, because I was withing speaking distance, To come get my "F'ing" dog. I would have been okay with that and apologized.
But shooting? WTF????