Hi Jack,
There is a wide spread of info available on here, you nearly always get an answer, if not an answer you get suggestions or conversations happening and if last night is anything to go by I think it has been a complete success. Dog ran out a couple of times, did a couple of barks, just out of habit I think and then would come back inside. This was all before 10.00pm, but as the possums weren't there he lost interest. Now my problem is I don't know what did the job, was it the owls or was it the moth balls