Do not disturb the sleeping dog.
Non istuzzichi più il can che dorme.
Original text (Italian)
Notes from Wikiquote
Slightly altered in Hoyt's New Cyclopedia of Practical Quotations (1922) p. 198: "Non stuzzicare il can che dorme."
Original text (Italian)
Quote text and notes from Wikiquote: Alessandro Allegri (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.