I'm lucky I have rarely had nightmare's however one sticks firmly in my mid form when I was about 6 or 7 years old. It's one of the few times I have actually woken up screaming from a dream to find myself being comforted by someone.
It was set in the next village along from where I grew up, and I was alone, next to this river surrounded by lush pasture. Alone except for two dogs on the opposite bank of the river. Not ordinary dogs but ones which had huge fangs which were dripping drool and saliva everywhere. I shouted out for help. Then I remembered everyone else in the surrounding villages were dead, having caught rabies from these dogs. I have vague memories of the dogs jumping into the water and almost catching up with me as I ran. That's when I woke up, o maybe was woken up ny my mother.
It might explain why I still feel nervous around dogs. I think the dream was a result of those public information films they used to show at the time of people coming in to land on a deserted beach with a dog. The story behind the film being that they had been abroad, and had brought their dog back with them secretly without going into quarantine.