[Graybeard58]

Ping.

Thought your "doggy ping list" might be interested in this.

[Dysart]

Three-dog night: The Australian aborigines, and others, slept with dogs to keep themselves warm. So, a three-dog night was considered especially chilly.

Well I be doggone... that's something I did not know. There was a story of a lost child some time back who had his dog to keep him warm as the temp plummeted, and likely kept him alive.  Many of the other expressions are fairly intuitive.