I think most cities have a regulation of how many dogs you can have ( but someone would have to report you for them to find out I think).
Wolf_Q At least they put it some what nice on the paper and didn't just call the cops. I think some neighbors will complain about anything a pet does just to make you miserable. We have had those hang up calls also and our dog was in the house sleeping ( as we were b/4 the phone call)!