I leave my house to walk my dog. When I get to the end of my driveway I look up the street and walking down this stretch of street without any street lamps is this large black quadruped shadow. At first I thought it was a dog but then I realized that whatever it was it was only shaped like a dog. I couldn't stop watching it as it came closer and it brought with it a growing sense of dread but as it reached the circle of light from the streetlamp in front of my house it vanished (like when fog dissipates, it just faded away). I continued walking my dog but the entire time I had this feeling something was following behind me. As I reached the park I was struck by the feeling that it wasn't a good idea to continue and had to turn around and go home but the entire time I had the feeling there was something back the way I had come waiting. It's been a few hours since then and I just went outside and I swear I can see it hanging out on the roof of the house across the street.
I was wondering if anybody has any insight into what this might be and if I should be worried about it.
You could have seen a) an apparition of a dog's spirit b) the legendary hell hound. C) your spirit guide/animal. But I'm pretty sure a spirit guide/animal wouldn't make you scared.
Could also have been a primal nature spirit, they tend to take on a shadowy animal form (I once saw one that looked like a LARGE cat, and it followed me and the others I was with for a bit, and we all caught at least a glimps of it). It could also have been a shadow creature, creatures that have a shadowy form (usualy they result from dimentional slips, my brother saw one that didn't even resemble any known animal, but it was fairly large). There is one other possibility, something I encountered a while back,it looks like a darker darkness within darkness, though the one I saw was formless, though the way it moved it defenitly had intent. Of course I wouldn't rule out other possibilities, these are just ones that I have some experience with, I hope it helps
Doesn't sound like anything good. Protect yourself and your house, preferrably one that is offensive as well as defensive. I personally like invoking the rune algiz with the rune thurisaz in front of it to send it flying if it tries to break the protection of algiz. If it continues to stalk you, call in the help of a higher being, whatever fits your beliefs--angel, deity etc. Do a full ritual including an offering, don't just pray.
If you are going to call an angle, I would recomend Michael, he has gotten me out of a few jams myself, and has never needed an offering of any kind for his help. If you feel like you are threatened by a supernatural being, just simply say: "Oh, Michael, Archangel of the South, please protect me." This is just an example, its best to come up with something personal, or something for your situation
Stabbing and shooting shadows is generally a bad idea. Shooting in particular.
However, I am curious how your dog reacted.
I have seen such spirits before, and they are often aspects of nature rather than any sort of more intense higher/lower spirit. Leave it alone and it will likely leave you alone. If you are actively shielding yourself constantly in positive energy and white light, that can also accidentally attract attention that you don't exactly want from such things.
Where you first saw it, was it near an empty lot? Had large amounts of forest been cleared away? Or had there been other such drastic change in the environment or surroundings?