Wiktionary
vb. (context idiomatic English) To leave things as they are; especially, to avoid restarting or rekindling an old argument; to leave disagreements in the past.
Wikipedia
Let Sleeping Dogs Lie is the sixth book in the Hank the Cowdog series of children's novels by John R. Erickson. It is preceded by Faded Love and followed by The Curse of the Incredible Priceless Corncob.
Like almost all the Hank the Cowdog books, this one begins with Hank saying, "It's me again, Hank the Cowdog."
The characters are: Hank the Cowdog, Drover, High Loper, Sally May, and dog named Ralph (although Hank keeps calling him Clyde).
Usage examples of "let sleeping dogs lie".
Nancy says later that we should let sleeping dogs lie and that he's probably left his fingerprints all over the scene of the crime and you can be sure Sergeant Donovan will be round sooner or later.
In my years as your cousin and business associate, I have learned that it is frequently best to let sleeping dogs lie.
She thought it best to let sleeping dogs lie, so she did not ask for an explanation of their frequent meetings.
You can still publish your book as it is and let sleeping dogs lie.
That enlisted clerk and the Cherokee breed might have still been alive if old Fred had let sleeping dogs lie.
As Anna drove across the broad salt flats to the west of the Guadalupe Mountains, the bold gray prow of El Capitan cutting into the morning, she knew that she, too, wanted it to be over, wanted to let sleeping dogs lie, wanted to get on with her life.