Hopefully he will grow out of it. He knows now that people come home again, just a matter of time.
My neighbour 2 doors down did the same thing, rang the council instead of talking to us. Like you I was very concerned, then found out the feckn old prick (neighbour) used to pop his head over the fence to see what she was up to and provoke her more. She was only a few months old then but grew out of it. Dog Ranger was good and shrugged it off when he seen her and said he really only came to check her rego.
Hope it all works out ok for ya.
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