Man up! it's just a wolf.
Talk is cheap!
I came across a wolf* once. And I almost pooed myself. I was living in a scarcely populated part of Norway (where it is just forest for several days walk in all directions) and went out one evening, at about 7pm, for a few hours of cross-country skiing. Well.. it was soon pitch black and began to snow. No moon, either. I went further than i'd intended and soon got lost. So i sat down to have a think about the map i'd seen earlier in the day, hoping to get my bearings. By now, the snow had covered my tracks and was coming down thicker and thicker. I reckoned i'd come to such and such a point and would be able to complete a triangle (and thus get home quicker) by going a certain way.
It didn't go according to plan and, after a while, i was more lost. More lost, in that now i didn't know whether to go left, right, straight on or back. I was exhausted as i'd been skiing for several hours. It was pitch black and snowing. I couldn't see for more than a few yards in any direction. I was tired, hungry and thirsty, and had to get up for work early in the morning. The thrill of the adventure was wearing thin. Hope! There was a very faint orange glow above the trees off to the right. The low cloud must be reflecting the street lamps of Gjøvik and/or Hamar! So i headed roughly towards this faint glow knowing i'd come out of the forest sooner or later. It was just a matter of keeping on going.
Another hour or so went by, and coming up a short incline a heard a 'Woof!' close by off in the darkness ahead and to the right. This is wolf country. Whilst, normally, i'm a sensible chap, and have read that wolves are more afraid of humans than we are of them, and they never attack without a very good reason (like being hungry for example). At this moment I was more of a disoriented, exhausted and weak Mancunian, in a boreal, snow-decked forest in the middle of the night faced with one of nature's most cunning and merciless hunters. I stopped dead. Shivers went up my spine. I shouted a loud 'Oi!' and put my skiing poles together, and held them ready to fend off the beast. Waited.. Nothing.. Waited some more.. Silence.. I couldn't wait around to become dinner anymore. So i moved off slowly keeping my eyes and ears peeled, with my sticks raised. I began to sing "Show me the way to go home" figuring that the Wolf or Wolves would be detered by the sound of a human voice. After a while I picked up speed (if you've seen me skiing 'speed' isn't the right word) imagining the beast/s just on my back. It took me another hour to get back to somewhere i recognised, and i'd sung all the way. I'd been thoroughly exhausted and didn't know how long i could carry on but, after the encounter, i'd found the inner reserves of strength that we all have buried deep away. I'd magically improved my braking and turning too. I arrived at work the next day late.
I can understand the OP's concerns. Fear and danger is a matter of perception. I think he should impress upon the owner his concern, and if the OP doesn't report the dog this time the next person might well do.
* A workmate phoned a hunter friend of theirs and he reckoned it was a roedeer. But to my dying day the story will remain one of man vs. the primeval.
