Dog don’t eat dog.
Dog eat dog.
Don’t count the chickens before they are hatched.
Don’t cross your bridges until you come to them.
Don’t judge a book by its cover.
Don’t look a gift horse in the mouth.
Don’t make a mountain out of a mole hill.
Don’t put all your eggs in one basket.
Doppelt genäht hält besser.
Du bist nur einmal jung.