Security is such a basic need that ways to keep people safe & secure have existed for as long as civilisation has but have security dog units always been there?

Keycards are a major part of access control and corporate security, even if many have been replaced by keyfobs, but what was the first use of either system?

Project Acoustic Kitty was a very unusual espionage operation that, had it been successful, could have changed the process of corporate surveillance forever.