Dream about dog attacking someone signifies a need for security and nurturance. You are being your true self or that someone is being their real self. You are trying to rid yourself of certain feelings. This symbolises self-guilt and unnurtured feelings. You are going off track.
Dog attacking someone dream is an indication for helplessness. Perhaps someone or some situation is literally driving you crazy. You need to make a more informed decision instead of relying on fate. This dream is a symbol for virginity, pureness and secrecy. You are in need of some support.
If you dreamt about dog attacking someone:
This is a day for the kind of date you had only imagined in your wildest dreams. This person may not care for your sense of etiquette, your feelings of cooperation, or about trying to be especially nice. But then, for once you may enjoy the feeling of just succumbing to someone who knows what they want, and who intends to get it.