The dog gets into the mill under cover of the ass.
More French Proverbs:
Foxes come at last to the furrier's.French
He who waits for a dead man's shoes is in danger of going barefoot.
French
The first love letters are written with the eyes.
French
If you want to love your household as much as your bread then you will have to knead your wife like dough.
French
He is not so much of a devil as he is black.
French
All is not lost that is delayed.
French