One wolf does not bite another.
More Spanish Proverbs:
Two boys are half a boy, and three boys are no boy at all.Spanish
If you pay not a servant his wages then he will pay himself.
Spanish
Even a sugar mother-in-law tastes bitter.
Spanish
There is no pot so ugly but finds its cover.
Spanish
Better lose a supper than have a hundred physicians.
Spanish
He who has both money and bread, may choose with whom his daughter to wed.
Spanish