"No, I won't tell," promised the dog and then, all of a sudden, he grew much excited and whispered: "Quick, Racky, rock away as fast as you can!  I see a policeman passing along the street between my house and your house.  Maybe he is coming after you!  Rock away!  I'll chase my tail here in the weeds and bark loud, and the policeman will look at me and he won't see you.  That will give you a chance to rock away and hide!  Quick!  Go on!"