The fox is a predator of great cunning and wiles. As such, to dream about the fox is to see oneself as either possessing or being victimized by such attributes. The focus on this symbol should be your sense of fear or kinship toward the fox. Whether you like or dislike the fox will determine the representation of the world and your relationships in it. If the fox is an adversary, the object that the fox is trying to take from you may be revealing.
A fox appearing in your dream should indicate that the qualities you most associate with a fox are somewhere at play in your life; either by you against someone else, or by someone else against you.
Is there someone else in the presence of the fox that shares its qualities? Is there another person in the dream who seems to be approaching you with caution?