Ok so I went to Sarethi Farm a minute ago to deliver crimson nirnroots. Before I could though, a normal dragon roared above so I dragonrended it and killed it with a Daedric dagger.
After I turned in the roots I started to walk down the road from the farm and got to where the carriage is on fire. I encountered a cave bear beside it and killed it. Well as I turned around to keep walking the same road, I saw a dead Blood Dragon on the side of the path. I'm guessing the cave bear kiled it.
I'm thinking to myself how many others have encountered a really random dead dragon and wondered what happened to it.

Where & what kind of Dead Dragons have you encountered in your travels, and whats your oppinion on how it died?

Never seen it, maybe some guards killed it? If the dragon is related to a quest it will respawn

I have once but it only happened after i killed a dragon and its soul glitched. Later i wan walking along a path and a dragon body fell out of the sky and gave me its soul and i was like WTF . I have also had mamoths fall out of the sky so maby that is how your dragon got there.

One time I watched a dragon killed by cave bear(s), all I had to do was kill the bear and absorb the dragon soul, and loot the body.

No, never that, but sometimes skeletons of named dragons i've killed appear out of thin air, and once a dragon Al... worked his magic on didn't work quite right, and he fought me as a skeleton. Very much like the one at the start of the final dungeon of CW questline.

One time when I was leaving the college in Winterhold, a dragon skeleton (I had recently killed one near the jarl's hall in winterhold) fell on top of me.

The only glitch I have had with dragons is I had a random dragon spawn near a dragon lair. I was hoping for a two dragon fight. The dragon from the lair just flew around and I could not get him to engage.

I've had the skeletons of dragons I've killed earlier in the game fall out of the sky after I leave a cave. One time my character was hiking down a path by a steep cliff, and a dragon skeleton just rolled off the mountain and fell on my character.

Funny glitch.