Haha, I can go both ways with this. One, it reminds of of walks along the water ways with my dog (since passed); two, maybe it isn't a dog, which creeps me out (as I can see howling faces in the trees on the left). A shot that leaves the story telling to the viewer.
See the light appearing through the trees on the left? The right one looks like a bear or wolf. Perhaps HE is calling that dog to come over to the dark side!!!
If there was a full moon out I may have been a little more scared. Forgetting the 'werewolf' metamorphism for a moment I love the B&W treatment and the rather odd sky helps the scene.