One wolf does not kill another.
More Portuguese Proverbs:
He is no friend that eats his own by himself, and mine with me.Portuguese
The mouth that says "Yes," can say "No."
Portuguese
I see by my daughter's face when the devil lays hold of my son-in-law.
Portuguese
The beast that goes well never wants a rider to try its paces.
Portuguese
Michael, Michael, you have no bees, and yet you sell honey!
Portuguese
A shut mouth keeps me out of strife.
Portuguese