Though your mastiff be gentle, do not bite his lip.
More Portuguese Proverbs:
A good cock was never fat.Portuguese
No one is always right.
Portuguese
From a closed door the devil turns away.
Portuguese
Time and the hour are not to be tied with a rope.
Portuguese
A good word quenches more than a cauldron of water.
Portuguese
Visits always give pleasure -- if not at the arrival, then at the departure.
Portuguese