Although Greg (more than) filled his allotted hour, there was much more that he could have told us. Members interested in exploring further might like to begin with the NAA Fact Sheet 130 that not only provides a nice summary but also includes references to Series Numbers (and clickable links) at the Archives to records from various agencies and departments involved (Royal Commission on Espionage, ASIO, Department of Prime Minister, etc). Readers wanting more on the particular subject of D-Notices will also find a useful Fact Sheet 49.
Certainly most of the 605 items found will require a trip to Canberra to view but there are plenty of digitised records to keep you busy. (And if you use Advanced Search, you can limit the results to Digital Copies Only.)
Sadly, it appears that the ASIO photographers were not dog lovers, but we can see where Mike Myers may have found the inspiration for his character, Dr Evil.
On the other hand, Trove is always a reliable source and members can use it to explore stories such as Petrov's Dog Keeps Vigil For Master (SMH 30 Apr 1954).
Some people may wonder whose family history was dealt with in Greg's talk. Was it just an entertaining story? in fact, it has a crucial message for all of our research. When you take a broader approach and look back before the obvious event, you may discover some very important but unexpected causal connections. Similarly, casting your eye forward can reveal consequences that were not immediately obvious.
The great blow-up between great-aunt Lillith and her daughter-in-law certainly took place on that awful Christmas Day but were the seeds sown much earlier? Was it really to do with who was (or was not) invited to the wedding in the previous year. And what part did the feud play in who got Granny's best china many years later. It is always worthwhile to spread your research into any "event" beyond the apparent focus. You may not discover the unseen hand of Stalin or Menzies, but ... knowing Lillith ...