Nice, I didn't want to kill my horse after it had been with me for a while to get rid of it, but I'd also gotten fed-up with the third person view ruining immersion for me, so I stopped using it. When I fast-travel, it used to follow me about, but now, I've just noticed it's actually in the Whiterun stables (not standing outside on the road by the stables, actually in the stables) - and doesn't follow me about in fast travel, which is pretty neat. I'm glad you're not dead horse, but I'm also glad I don't have to ride about on you or worry about leaving you behind in the wilderness...

How did you get stabled? I ki....Accidentally, killed it with the fire breath shout making him burn and fall into the ocean from a very high cliff.

I just didn't use it, every time I fast traveled I just left it alone, or just left it alone and travelled from cities. Eventually it just stabled itself... not sure how many in-game days it took (I rp so my character often spends a lot of time resting).