That's terrible! I had awful neighbors before, and they'd throw their cooked chicken carcasses over the shared fence. WTF?! They didn't like GSDs - when I yelled at them they said they thought my dog would like it....yeah right. They also called AC on me, but then they came out, they knew it was a nuisance call. Jeez, some people. How can you get rid of them?!? I'd try to phone in a report too, you never know if it will be helpful to have this on record.