To dream that you are using a decoy, indicates your tendency to mislead people. Your conscious may be appearing in your dream to try an steer you back in the right direction.
To dream that you are a decoy, represents self denial or self deception. You are trying to tell yourself to believe one thing, but really feel differently.
Any kind of decoy seen in a dream, whether it is intended for animals or for people, denotes the deceit of someone for whom you have had affection.