This ALWAYS happens to me after I press the growl button a couple of times. Just exit the game and reload it and it's back to normal. Sometimes if you switch your wolf or don't press it for a while it may be fixed but I highly doubt it. I like using the grow, button because sometimes it makes the enemy dizzy and freezes it just for a bit, and it also has some effects like one wolf has the mark of the wolf, then another has the mark of the fox, etc.