A shoemaker’s wife and a smith’s mare are always the worst shod.
More Spanish Proverbs:
Look not out for dead men's shoes.Spanish
What much is worth comes from the earth.
Spanish
Of what you see, believe very little, of what you are told, nothing.
Spanish
Two birds of prey do not keep each other company.
Spanish
A friend to everybody and to nobody is the same thing.
Spanish
Avoid a friend who covers you with his wings and destroys you with his beak.
Spanish