From reading the OP I don't believe that the pooch has displayed any interest yet in running, trailing, or hunting chickens. In my opinion confronting neighbor before the fact is not a wise use of community good will. It will only earn you the title of the Neighborhood Grinch, and slinging threats invites preemptive revenge from your neighbors, very likely at the hands of the same ANIMAL CONTROL agency you would use. Not only will an electric fence solve this dog problem, it will solve 99.9% of all future 4 legged critter problems maybe for the next 50 years and dogs don't talk.