[kingpin]

Since I moved into this house last year the neighbours dog a couple houses down that they let wander around keeps coming over here. My dog has attacked him twice now.
I have approached her many times last year (at least 3) and she has done nothing about it. I explained to her my dog isn't friendly towards others, especially to dogs twice his size or larger like hers.
Just now the same thing happened and Wendel ended up with a big mouthful of his fur.
This is a very small neighbourhood around 100 houses so I don't want to cause shit. So many things have gone through my mind but it's all about punishing the dog (shooting it with a paintball so the neighbour has to wash him, dog spray deterrent) and not the neighbour who is at fault.

Other than making a stink with the city or animal control any ideas?

P.S. This is all happening on my property.