To hear a quack in your dream refers to an unoriginal idea. Someone may be trying to pass off an idea as their own. Alternatively, to hear quacking symbolizes imitation.
Quack Medicine
To dream of taking quack medicine indicates that you are taking the wrong course of action. You are approaching your problem all wrong.
To see or meet with a quack doctor in your dream means that you need to be more cautious of people who claim to be something that they are not. Someone in your waking life may be falsely building themselves up.
« Back to Dreams Dictionary
A denigrating word for an incompetent doctor, or the sound that a duck makes, especially if the dreamer is looking forward with anticipation to the duck hunting season.
If a medical-type quack was featured in your dream, you are being cautioned against accepting new acquaintances at face value. Otherwise, see under Ducks, Geese, or Fowl.