Friends of mine shot the neighbours dog three times over the years. They are out past Barrhead. They told the neighbor a number of times to keep the dog off the property as it was harassing and killing some livestock.
The dog hops up with three legs and one eye and all scarred up and I asked what happened to him and got that story. They said since he didn't die they figured that it deserves to live. Seems to have tamed it down quite a bit as well.
I'd try a couple of more times to talk since I'm a fan of dogs but if that doesn't work then it's not like you didn't try.
Just read the full story. Plug those things