[2banana]

Call the police and report it.
Find something for self defense.
Let you neighbors know (by registered mail) that you felt threatened and how letting their dog run loose is a violation of city ordinances
Get some photos

It is all about documentation to CYA if something bad happens...

[Kartographer]

"Call the police and report it."

Tell them you think your neighbor might have torn off those labels that you aren't to remove under penalty of law or that they put their recyclables in the regular trash or that you think they are having an illegal Bible Study meetings. When the Cops raid your neighbor's house the situation will quickly be taken care of!