Hello Reject. I am of course, referring to your username.
Anyway, the black wolf could represent an old habit or instinct. Is there something in your personal life that is weighing you down? Do you have anger issues?
The part where the wolf becomes tame and lead you in the river could indicate that you feel secure in your old habit but you know there is an emotional price to pay. Rivers and water in general are usually a symbol for the emotions.