L 18. I fast forwarded back to Hilligrund's Tomb after selling some stuff. When I arrived, there was a flash of fire around me. I turned and there was a dead dragon. Death by Fast Forward? (joking). Anyone have that happen?

Yes and sometimes it is the skeleton of the Dragon that I just killed. It just drops in from the sky, dead. Too funny.

It happens i heard i guys dog killed a Dragon by Barking at it.

Sounds like something my REAL dog would do!

Sometimes NPC's can kill Dragons.

I've had an "incident" near the top of Throat of The World where I was the only person, fighting a dragon. Mid-flight the dragon just fell, still alive and breathing fire. It hit the floor about halfway down the mountain. Climbing down to kill it, I found out the Dragon had actually FALLEN to its death.

Yes that's right. The Winged Beast had FALLEN out of the sky for no particular reason! It wasn't as though I had damaged it enough for this to happen, the fight had only just started and I'm playing on Master with several mods that increase difficulty.

I think it's just a glitch or something. Just be glad, it's a free Dragon Soul

Conversely, giants can send dragons flying

obviously a zombie dragon which will animate the second you leave