How is “let sleeping dogs lie” used?

In Deconstructing Harry (1997), one line is: “Maybe the best course of action is let sleeping dogs lie.”

Which movie is “let sleeping dogs lie” from?

The clip at the top of this page is from Deconstructing Harry (1997).

to avoid mentioning a subject or sth that happened in the past, in order to avoid any problems or arguments

Heard in 2 moviesPlay Proverbs

Oxford100% of films
to avoid mentioning a subject or sth that happened in the past, in order to avoid any problems or arguments
Maybe the best course of action is let sleeping dogs lie.
Let sleeping dogs lie.

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

Maybe the best course of action is let sleeping dogs lie.

Said in 3 films · #1