[voodoosdv]

But to get back to the original post, there is this dog that has bit once, that is aggressive, and that the poster was concerned for his childs welfare. What should he do?

Sorry, we have segued a bit haven't we?

This individual case: Convince the owner to keep this dog off the soi. Diplomacy seems the strategy least likely to produce unintended consequences.

Longer term solutions: Control of soi dogs to keep them as disease-free as possible and to remove the dangerous ones.