Topics

http://www.armageddononline.org/

That is a site that pretty much lists all the ways we can die, and we basically can't do a damn about it.  Except the site seems down sorta at the moment.  But, to add to the list of ways we can die...

Gamma Burst
The supersuper nova thing (that might be the gamma burst)
Meteor strike
Supervolcano (The entire park of Yellowstone is one big supervolcano that is 40,000 years overdue to blow... it'll be like 1000 mt st helens going off at once or something like that)
Megatsunami (this won't end the world, but will do a truckload of damage)
Methan Bursts.... huge bubbles of methan trapped under the oceans... when those burst.... ack.
And more I'm probably not thinking of right now.

You're not cursed or anything as far as I know. You probably have a strong sixth sense or whatever you call it. However, I have heard of black dogs and it could be an omen of some sort. Small children often see shadow people, creatures, or animals because they are naturally psychically strong at that age. As long as this isn't reoccuring, I don't think you have any need to worry.