these sleeping dogs won't lie

"These sleeping dogs won't lie, as opposed to "let sleeping dogs lie" meaning:

1.To avoid starting old conflicts
2.Not to disturb a situation as it is

So "These Sleeping Dogs won't lie" means:

1.Some kind of conflict continues and "rears it ugly head"

Example: These sleeping dogs won't lie can be said about:

1.An issue that is still unsettled
2.Conflict between countries etc.