Please elaborate
It's not something you don't already know, I can tell by the way you've written about it. Your mind chose a certain symbol (a "big, dark, monstrous" wolf) and you've described your response to it in very exact terms (the feeling that it might possess you and it grows stronger and closer as time passes). In psychology, this is called a "totem" and it symbolises something of personal meaning to you.
Different schools give different interpretations.
A psychoanalyst would start talking about your mummy and daddy (by which they mean an authority figure) and that as you age, you turn more like them which is a cause for your dreams, as a certain part of you resists this process due to unresolved conflicts towards those authority figures.
A cognitive-behaviourist would interpret your totem as a symbol for a certain type of behaviour towards others which you want to but feel that you cannot adequately control and it is the guilt over that which is causing your dreams.
A narrative therapist would tell you that you're thinking your life and environment are taking certain directions that scare you and you feel that you cannot control them easily.