This crazyass horse charges into forts, bandit camps and wolf dens kickin the hell out of everything. I thought having a follower was annoying at times but now this horse gets in my way just as much!! It charges up steps I can barely get on, takes fifty arrows to its body and kills and entire group of bad guys!! When a dragon comes Shadowmere is the first on the scene!! Kicking and screaming lol!! WTF? Shadowmere has been shot,shocked,flamed,frozen,bitten by dragons and nothing stops him. When my follower uses any kind of magic staff the damn horse gets in the way and next thing you know my follower and the horse are going at it!! How do you stop this?? Is it worth putting Shadowmere down?

...is this a joke...?

Yeah, all horses that you own will attack anything that has aggroed or targeted you. If a dragon is attacking from the air horses will avoid them, but on the ground they will attack dragons. I don't use followers so IDK about followers fighting him, but I suspect if he accidentally hit one they might get 'red dot' on him. If you kill him he'll respawn in like 3 game days in the spot where he was 'killed'.

Shadowmere is a wonderful horse, I once watched as he (she?) kicked the living snot out of ancient dragon. However, as you have noticed, his/her enthusiasm for a scrap can cause complications especially when there is a follower around. The best solution I found was to park the horse at a safe distance from any likely combat and walk the final few hundred yards.

Beware though, Shadowmere, when left alone, sometimes goes off on his/her own adventures. I once left him/her at a mill while I went off to explore the surrounding area. I hadn't gone too far when a dragon appeared overhead and was obviously spoiling for a fight. Safety in numbers and all that, so I turned round and sprinted back to the mill. When I got there, well ahead of the dragon, I saw Shadowmere off in the distance swimming across the lake away from me. Having sorted out the dragon, I continued with my original plan and when I got back to the mill the next day there was Shadowmere, for all the world as if he/she had been waiting there all along. What he/she had got up to I never discovered.

Putting a horse like that down is unthinkable.

I cant find shadowmere... Where is he/she?

Here:

I loves my boy, I would be lonely without Shadowmere! (and other weird emotions)

Once I was sent to a dragon lair and got a two-fer (the one with the word wall and a nearby tower with dead bandits inside) so I called Ohdaving. After both bad dragons were finished I looked down the path to see Shadowmere fighting Ohdaving! (He/she must've gotten flamed by accident from Ohdaving I figure)
I had to run down and jump on Shadowmere's back to break it up!

But as HurstLlama suggests, sometimes I park Shadowmere and set off on foot.... usually the bigger stables are good for that. I remember parking him at that farm just near the Solitude stable, and when I came back he had moved up to be nose to nose with the pretty paint horse in the stall, lol, he's an animal.

Be careful - he also likes to gossip with deer.
http://i1209.photobucket.com/albums/cc398/buckomccane/Skyrim/gossiping_deer.jpg

I got so miffed with Shadowmere, I parked the horse outside Dawnstar sanctuary, opened up the console, clicked on the horse and typed in 'kill'.

The last time I visited the sanctuary, Shadowmere was alive and well, standing in the exact spot I left her.

Yep, Shadowmere is a Nightmare and an Aspect of Sithis. He's one nasty SoB.

Yep, he respawns (I've heard 3 game days later) in the spot he was killed.

Yes, Shadowmere is great. But also such a pain in the rear. Every single time I come across a dragon... Shadowmere runs off. No no, not like that. I'm assuming he's looking for higher ground to reach the dragon, possibly following the dragon's flight path. I don't know. Usually the dragon goes with so I have to sit there chasing them down yelling at them to come back. Bloody annoying, really.

I do what HurstLlama does. I park my Shadowmere a distance away when I'm expecting a brawl. I generally like fighting by myself, so keep him at a distance.

I recommend getting rid of the follower because Shadowmere is a complete tank, it also doesn't block your way when you enter a dungeon.

Good luck killing him even if you mean too...

Well.... on pc you can enter console, click on her, and enter MarkForDelete. Gone Shadowmere upon saving/reloading.

I used to love shadowmere....then he died and I forgot where his body was at. At first I was really ticked off because I loved scaling cliffs that I couldn't possibly do on foot, and I missed having him as a training dummy. Though, now I'm feeling the comforts again that I lost with the horse before. Like fast traveling to a forsworn camp and not having to worry about the horse being killed, or having it chase off something far away while I'm left to crawl to when weighed down by loot, or desperately trying to peel a dragon off from attacking it.

We need a 'Whistle your horse back once a day' power adding to the Steed stone

Seriously, having an option to set a horses Fight-or-Flight response would be useful because vanilla horses are suicidal.

Both of these, please.

I disabled him and Frosty, Frothy, Foggy...? That one from Riften, Maven's nag. Stupid horses. Plus they broadcast your whereabouts to any enemies in the area. If one sees through your sneak, and they will with that horse anywhere within 6 holds of you, then ALL the baddies will see you. Those horses are better converted into glue and dog food.

It's kinda becoming a pain. I look away for one second and he's halfway across the plain trying to kill some dragon. Though he did deliver the final blow to the dragon. But I'm just glad he is like iron horse. You don't know how many times he's fought a dragon, ran off a cliff and lived to tell the tale.