Well, it’s the owners for sure, but not as evil as your neighbors. These owners have indoor dogs, and no fenced area, so they just let the dogs out to do their duty.
Next thing you know, they are roaming around the neighbor hood, just being regular dogs. They are friendly to humans and other dogs they encounter on their trips.
My grand kids dog-I dogsit- is not friendly to other dogs. She is a combo rat terrior and jack russell terrior, and fiercely defends her turf from anything that moves except humans.
She welcomes all humans with tail wagging. In addition she barks to welcome family members, but is totally silent when unknown people come around. Totally worthless as a watch dog from that respect, but she is protective of the family.
Funny you should mention that. Our mailbox was whacked sometime last night. We have a security system but Mr. Sg shut it off overnight.